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Discussion Starter #1
The problem: The steering on the vehicles that utilize this part slowly gets less responsive, feeling a little like a worn rag joint and a little like the steering box is in need of a fine tuning, or worse replacement. It starts a little at a time and worsens to the point where it feels as if, while making a turn, your front wheels have both slipped sideways -as if you have just hit a small patch of black ice.The front end suddenly sideslips; but not to the point where you lose any real control. It is more like feeling a very strong crosswind on the freeway.

You will also start to feel as though your steering linkage has become loose- you get the feeling as though the pitman arm that controls the rest of the steering linkage has a couple inches of slop in it that only shows up when coming off of a direct straight-ahead course. Most turns of the wheel- noticably between the 11 'oclock and 1 'oclock position, become from clicky at first to clunky, if not fixed.

The details: The problem is all to often a part on the steering shaft that is known as the "steering Speed Sensor"
It is mostly a dealer chevy part and even www.gmpartsclub.com and their ilk may run 60-75 bucks. The discounters usually make up on the low price with absorbatent shipping. The GM part number is 26064468. Many references to this part are made as "the EVO" You'll get further faster with the parts guy by saying "steering Speed Sensor". AFter searching and finding it at 1A auto.com for 27.95. I lit up only to see that they were out of stock. More searching turned up a replacement at NAPA Auto Parts p/n BK 620-2250- go pick one up for 35.99- can you stand it?

Installation: Tools: get a small bright flash light, a medium length "prying thickness screwdriver, household weight hammer- not too big-no room, a shop towel, a medium length 15mm socket/ratchet wrench. Comfy clothes that you can move upsidedown in.

The removal/replacement. Time 20-30 minutes. Near the bottom quarter of the steering shaft- under the dashboard, you'll find a cast metal collar that belongs to the steering shaft that passes through the firewall and connects to the steering column in the vehicle. A plastic ring circles the shaft above it. This is where you'll be working. Before disconnecting the neg battery terminal at the battery, watch the shaft from under the dash. With the key in place to unlock the steering- you may have to start the car, turn the steering wheel until the nut on the steering shaft can be easily accessed with a socket wrench. Turn the wheel back and forth to relax the wheel in this position, then remove the key from the column- locking the wheel in this position. Now disconnect the neg battery lug from the battery.

Remove the nut from the shaft- Don't confuse this nut/bolt with the two bolts holding the steering column to the frame. Use the hammer and screwdriver to tap the bolt upwards and free of the column.

The lower shaft must now be pulled a few inched back about 4-5, to allow removal of the old sensor. Use the hammer handle to slowly massage the cast collar back towards the hole in the firewall on the lower end of the shaft. It will take some effort; but work slow so as not to break the collar with the hammer. This seems like it would be easier in warm weather; it was cold where I live. Once the collar is completely free of the upper shaft spline you can remove the old sensor.

The chevy sensor is held inside of the visible plastic ring by 3 tabs- the kind that always break when you try to pull a connector out on a wiring job. The tabs are evenly spaced around the ring. There are slits next to each tab that you can put a very tiny screw driver in to dig the sensor out as the tabs are held back. I used some sharp point exacto blades as wedges and the sensor popped out as each of the tabs were pulled back. Once the sensor is free you need to disconnect the connector of the sensor's pigtail. It is a single connector with three wires. Note the routing of the wire and the look of the sensor's side that faces up toward the steering wheel. Slip the sensor off of the shaft. Use the screwdriver to pry the cast collar aside to make room for the sensor to come off, and again for the new sensor to be slipped on the shaft.

Connect the new sensor to the wiring connector before threading the sensor over the shaft. When the new sensor is on the shaft rock it gently upwards until it slides into place. The base of the new sensor's pigtail slips into a notch on the housing. Once aligned, the sensor can be seated past the 3 locking tabs. It is important to seat the sensor into the housing completely without damaging the center bearing assembly.

Button it up. The collar on the lower steering shaft must now be brought back in to slide up onto the shaft. This is the hard part- but only moderately so. By unlocking the steering wheel again and turning the shaft to match the collar assembly, a little massaging will get the collar on the shaft enough for you to start tapping the collar upward with the hammer. Do this until you see the bolt holes realign. Slip the bolt in from above. Start and tighen the nut to about 44 lbs. There is a rubber collar over the lower steering shaft on the engine side of the firewall. It seems to reseat itself; but check that it is in place.

Test drive.

This is one of the few elctronic parts that have truly felt as if there was a breakdown of the mechanical parts. Complete with clunking and bumping. You will save a lot by doing this yourself, before you have it diagnosed as a big, and possibly unnecessary repair. Good luck.
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Discussion Starter #2
Here is a follow up:

The part from Napa or the dealer chevy parts will fit:

2000
# 2000 GMC Truck Yukon-K1500 1/2 Ton 4WD 4.8 L 294 CID V8
# 2000 GMC Truck Yukon-K1500 1/2 Ton 4WD 5.7 L 350 CID V8
# 2000 GMC Truck Yukon-K1500 1/2 Ton 4WD 5.3 L 325 CID V8
# 2000 GMC Truck Yukon XL 3/4 Ton 6.0 L 366 CID V8 Vortec
# 2000 GMC Truck Yukon XL 3/4 Ton 5.3 L 325 CID V8
# 2000 GMC Truck Yukon XL 1/2 Ton 5.3 L 325 CID V8
# 2000 GMC Truck Yukon-C1500 1/2 Ton 4.8 L 294 CID V8
# 2000 GMC Truck Yukon-C1500 1/2 Ton 5.7 L 350 CID V8
# 2000 GMC Truck Yukon-C1500 1/2 Ton 5.3 L 325 CID V8
# 2000 GMC Truck K3500 1 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 2000 GMC Truck K3500 1 Ton 4WD - Pickup 7.4 L 454 CID V8
# 2000 GMC Truck K3500 1 Ton 4WD - Pickup 5.7 L 350 CID V8
# 2000 GMC Truck K2500 3/4 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 2000 GMC Truck K2500 3/4 Ton 4WD - Pickup 7.4 L 454 CID V8
# 2000 GMC Truck K2500 3/4 Ton 4WD - Pickup 5.7 L 350 CID V8
# 2000 GMC Truck C3500 1 Ton - Pickup 6.5 L 395 CID V8 Diesel
# 2000 GMC Truck C3500 1 Ton - Pickup 7.4 L 454 CID V8
# 2000 GMC Truck C3500 1 Ton - Pickup 5.7 L 350 CID V8
# 2000 GMC Truck C2500 3/4 Ton - Pickup 6.5 L 395 CID V8 Diesel
# 2000 GMC Truck C2500 3/4 Ton - Pickup 7.4 L 454 CID V8
# 2000 GMC Truck C2500 3/4 Ton - Pickup 5.7 L 350 CID V8
# 2000 Chevrolet Truck Tahoe-K1500 1/2 Ton 4WD 4.8 L 294 CID V8
# 2000 Chevrolet Truck Tahoe-K1500 1/2 Ton 4WD 5.7 L 350 CID V8
# 2000 Chevrolet Truck Tahoe-K1500 1/2 Ton 4WD 5.3 L 325 CID V8
# 2000 Chevrolet Truck Tahoe-C1500 1/2 Ton 2WD 4.8 L 294 CID V8
# 2000 Chevrolet Truck Tahoe-C1500 1/2 Ton 2WD 5.7 L 350 CID V8
# 2000 Chevrolet Truck Tahoe-C1500 1/2 Ton 2WD 5.3 L 325 CID V8
# 2000 Chevrolet Truck K3500 1 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 2000 Chevrolet Truck K3500 1 Ton 4WD - Pickup 7.4 L 454 CID V8
# 2000 Chevrolet Truck K3500 1 Ton 4WD - Pickup 5.7 L 350 CID V8
# 2000 Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 2000 Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 7.4 L 454 CID V8
# 2000 Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 5.7 L 350 CID V8
# 2000 Chevrolet Truck C3500 1 Ton 2WD - Pickup 6.5 L 395 CID V8 Diesel
# 2000 Chevrolet Truck C3500 1 Ton 2WD - Pickup 7.4 L 454 CID V8
# 2000 Chevrolet Truck C3500 1 Ton 2WD - Pickup 5.7 L 350 CID V8
# 2000 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 6.5 L 395 CID V8 Diesel
# 2000 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 7.4 L 454 CID V8
# 2000 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 5.7 L 350 CID V8

1999

# 1999 GMC Truck Yukon-K1500 1/2 Ton 4WD 5.7 L 350 CID V8
# 1999 GMC Truck Yukon-C1500 1/2 Ton 5.7 L 350 CID V8
# 1999 GMC Truck Suburban-K2500 3/4 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1999 GMC Truck Suburban-K2500 3/4 Ton 4WD 7.4 L 454 CID V8
# 1999 GMC Truck Suburban-K2500 3/4 Ton 4WD 5.7 L 350 CID V8
# 1999 GMC Truck Suburban-K1500 1/2 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1999 GMC Truck Suburban-K1500 1/2 Ton 4WD 5.7 L 350 CID V8
# 1999 GMC Truck Suburban-C2500 3/4 Ton 6.5 L 395 CID V8 Diesel
# 1999 GMC Truck Suburban-C2500 3/4 Ton 7.4 L 454 CID V8
# 1999 GMC Truck Suburban-C2500 3/4 Ton 5.7 L 350 CID V8
# 1999 GMC Truck Suburban-C1500 1/2 Ton 6.5 L 395 CID V8 Diesel
# 1999 GMC Truck Suburban-C1500 1/2 Ton 5.7 L 350 CID V8
# 1999 GMC Truck K3500 1 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1999 GMC Truck K3500 1 Ton 4WD - Pickup 7.4 L 454 CID V8
# 1999 GMC Truck K3500 1 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1999 GMC Truck K2500 3/4 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1999 GMC Truck K2500 3/4 Ton 4WD - Pickup 7.4 L 454 CID V8
# 1999 GMC Truck K2500 3/4 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1999 GMC Truck K1500 1/2 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1999 GMC Truck K1500 1/2 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1999 GMC Truck K1500 1/2 Ton 4WD - Pickup 5.0 L 305 CID V8
# 1999 GMC Truck C3500 1 Ton - Pickup 6.5 L 395 CID V8 Diesel
# 1999 GMC Truck C3500 1 Ton - Pickup 7.4 L 454 CID V8
# 1999 GMC Truck C3500 1 Ton - Pickup 5.7 L 350 CID V8
# 1999 GMC Truck C2500 3/4 Ton - Pickup 6.5 L 395 CID V8 Diesel
# 1999 GMC Truck C2500 3/4 Ton - Pickup 7.4 L 454 CID V8
# 1999 GMC Truck C2500 3/4 Ton - Pickup 5.7 L 350 CID V8
# 1999 GMC Truck C1500 1/2 Ton - Pickup 5.7 L 350 CID V8
# 1999 GMC Truck C1500 1/2 Ton - Pickup 5.0 L 305 CID V8
# 1999 GMC Truck C1500 1/2 Ton - Pickup 4.3 L 262 CID V6
# 1999 Chevrolet Truck Tahoe-K1500 1/2 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1999 Chevrolet Truck Tahoe-K1500 1/2 Ton 4WD 5.7 L 350 CID V8
# 1999 Chevrolet Truck Tahoe-C1500 1/2 Ton 2WD 6.5 L 395 CID V8 Diesel
# 1999 Chevrolet Truck Tahoe-C1500 1/2 Ton 2WD 5.7 L 350 CID V8
# 1999 Chevrolet Truck Suburban-K2500 3/4 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1999 Chevrolet Truck Suburban-K2500 3/4 Ton 4WD 7.4 L 454 CID V8
# 1999 Chevrolet Truck Suburban-K2500 3/4 Ton 4WD 5.7 L 350 CID V8
# 1999 Chevrolet Truck Suburban-K1500 1/2 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1999 Chevrolet Truck Suburban-K1500 1/2 Ton 4WD 5.7 L 350 CID V8
# 1999 Chevrolet Truck Suburban-C2500 3/4 Ton 2WD 6.5 L 395 CID V8 Diesel
# 1999 Chevrolet Truck Suburban-C2500 3/4 Ton 2WD 7.4 L 454 CID V8
# 1999 Chevrolet Truck Suburban-C2500 3/4 Ton 2WD 5.7 L 350 CID V8
# 1999 Chevrolet Truck Express G3500 1 Ton - Van 6.5 L 395 CID V8 Diesel
# 1999 Chevrolet Truck Express G3500 1 Ton - Van 7.4 L 454 CID V8
# 1999 Chevrolet Truck Express G3500 1 Ton - Van 5.7 L 350 CID V8
# 1999 Chevrolet Truck Express G2500 3/4 Ton - Van 6.5 L 395 CID V8 Diesel
# 1999 Chevrolet Truck Express G2500 3/4 Ton - Van 5.7 L 350 CID V8
# 1999 Chevrolet Truck Express G2500 3/4 Ton - Van 5.0 L 305 CID V8
# 1999 Chevrolet Truck Express G2500 3/4 Ton - Van 4.3 L 262 CID V6
# 1999 Chevrolet Truck Express G1500 1/2 Ton - Van 5.7 L 350 CID V8
# 1999 Chevrolet Truck Express G1500 1/2 Ton - Van 5.0 L 305 CID V8
# 1999 Chevrolet Truck Express G1500 1/2 Ton - Van 4.3 L 262 CID V6
# 1999 Chevrolet Truck Suburban-C1500 1/2 Ton 2WD 6.5 L 395 CID V8 Diesel
# 1999 Chevrolet Truck Suburban-C1500 1/2 Ton 2WD 5.7 L 350 CID V8
# 1999 Chevrolet Truck K3500 1 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1999 Chevrolet Truck K3500 1 Ton 4WD - Pickup 7.4 L 454 CID V8
# 1999 Chevrolet Truck K3500 1 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1999 Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1999 Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 7.4 L 454 CID V8
# 1999 Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1999 Chevrolet Truck C3500 1 Ton 2WD - Pickup 6.5 L 395 CID V8 Diesel
# 1999 Chevrolet Truck C3500 1 Ton 2WD - Pickup 7.4 L 454 CID V8
# 1999 Chevrolet Truck C3500 1 Ton 2WD - Pickup 5.7 L 350 CID V8
# 1999 Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1999 Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1999 Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 5.0 L 305 CID V8
# 1999 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 6.5 L 395 CID V8 Diesel
# 1999 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 7.4 L 454 CID V8
# 1999 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 5.7 L 350 CID V8
# 1999 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 5.0 L 305 CID V8
# 1999 Chevrolet Truck C1500 1/2 Ton 2WD - Pickup 5.7 L 350 CID V8
# 1999 Chevrolet Truck C1500 1/2 Ton 2WD - Pickup 5.0 L 305 CID V8
# 1999 Chevrolet Monte Carlo 3.8 L 231 CID V6
# 1999 Chevrolet Monte Carlo 3.1 L 189 CID V6
# 1999 Chevrolet Lumina 3.8 L 231 CID V6
# 1999 Chevrolet Lumina 3.1 L 189 CID V6
# 1999 Cadillac Escalade 5.7 L 350 CID V8
 

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Discussion Starter #3
also fit: page 2/2

1998
# 1998 GMC Truck Yukon-K1500 1/2 Ton 4WD 5.7 L 350 CID V8
# 1998 GMC Truck Yukon-C1500 1/2 Ton 5.7 L 350 CID V8
# 1998 GMC Truck Suburban-K2500 3/4 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1998 GMC Truck Suburban-K2500 3/4 Ton 4WD 7.4 L 454 CID V8
# 1998 GMC Truck Suburban-K2500 3/4 Ton 4WD 5.7 L 350 CID V8
# 1998 GMC Truck Suburban-K1500 1/2 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1998 GMC Truck Suburban-K1500 1/2 Ton 4WD 5.7 L 350 CID V8
# 1998 GMC Truck Suburban-C2500 3/4 Ton 6.5 L 395 CID V8 Diesel
# 1998 GMC Truck Suburban-C2500 3/4 Ton 7.4 L 454 CID V8
# 1998 GMC Truck Suburban-C2500 3/4 Ton 5.7 L 350 CID V8
# 1998 GMC Truck Suburban-C1500 1/2 Ton 6.5 L 395 CID V8 Diesel
# 1998 GMC Truck Suburban-C1500 1/2 Ton 5.7 L 350 CID V8
# 1998 GMC Truck G3500 1 Ton Savana - Van 6.5 L 395 CID V8 Diesel
# 1998 GMC Truck G3500 1 Ton Savana - Van 7.4 L 454 CID V8
# 1998 GMC Truck G3500 1 Ton Savana - Van 5.7 L 350 CID V8
# 1998 GMC Truck G3500 1 Ton Savana - Van 4.3 L 262 CID V6
# 1998 GMC Truck G2500 3/4 Ton Savana - Van 6.5 L 395 CID V8 Diesel
# 1998 GMC Truck G2500 3/4 Ton Savana - Van 5.7 L 350 CID V8
# 1998 GMC Truck G2500 3/4 Ton Savana - Van 5.0 L 305 CID V8
# 1998 GMC Truck G2500 3/4 Ton Savana - Van 4.3 L 262 CID V6
# 1998 GMC Truck G1500 1/2 Ton Savana - Van 5.7 L 350 CID V8
# 1998 GMC Truck G1500 1/2 Ton Savana - Van 5.0 L 305 CID V8
# 1998 GMC Truck G1500 1/2 Ton Savana - Van 4.3 L 262 CID V6
# 1998 GMC Truck Safari - Cargo Mini Van 4.3 L 262 CID V6
# 1998 GMC Truck Safari - Passenger Mini Van 4.3 L 262 CID V6
# 1998 GMC Truck K3500 1 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1998 GMC Truck K3500 1 Ton 4WD - Pickup 7.4 L 454 CID V8
# 1998 GMC Truck K3500 1 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1998 GMC Truck K2500 3/4 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1998 GMC Truck K2500 3/4 Ton 4WD - Pickup 7.4 L 454 CID V8
# 1998 GMC Truck K2500 3/4 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1998 GMC Truck K2500 3/4 Ton 4WD - Pickup 5.0 L 305 CID V8
# 1998 GMC Truck K1500 1/2 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1998 GMC Truck K1500 1/2 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1998 GMC Truck K1500 1/2 Ton 4WD - Pickup 5.0 L 305 CID V8
# 1998 GMC Truck K1500 1/2 Ton 4WD - Pickup 4.3 L 262 CID V6
# 1998 GMC Truck C3500 1 Ton - Pickup 6.5 L 395 CID V8 Diesel
# 1998 GMC Truck C3500 1 Ton - Pickup 7.4 L 454 CID V8
# 1998 GMC Truck C3500 1 Ton - Pickup 5.7 L 350 CID V8
# 1998 GMC Truck C2500 3/4 Ton - Pickup 6.5 L 395 CID V8 Diesel
# 1998 GMC Truck C2500 3/4 Ton - Pickup 7.4 L 454 CID V8
# 1998 GMC Truck C2500 3/4 Ton - Pickup 5.7 L 350 CID V8
# 1998 GMC Truck C2500 3/4 Ton - Pickup 5.0 L 305 CID V8
# 1998 GMC Truck C2500 3/4 Ton - Pickup 4.3 L 262 CID V6
# 1998 GMC Truck C1500 1/2 Ton - Pickup 5.7 L 350 CID V8
# 1998 GMC Truck C1500 1/2 Ton - Pickup 5.0 L 305 CID V8
# 1998 GMC Truck C1500 1/2 Ton - Pickup 4.3 L 262 CID V6
# 1998 Chevrolet Truck Tahoe-C1500 1/2 Ton 2WD 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck Tahoe-C1500 1/2 Ton 2WD 5.7 L 350 CID V8
# 1998 Chevrolet Truck Suburban-K2500 3/4 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck Suburban-K2500 3/4 Ton 4WD 7.4 L 454 CID V8
# 1998 Chevrolet Truck Suburban-K2500 3/4 Ton 4WD 5.7 L 350 CID V8
# 1998 Chevrolet Truck Suburban-K1500 1/2 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck Suburban-K1500 1/2 Ton 4WD 5.7 L 350 CID V8
# 1998 Chevrolet Truck Suburban-C2500 3/4 Ton 2WD 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck Suburban-C2500 3/4 Ton 2WD 7.4 L 454 CID V8
# 1998 Chevrolet Truck Suburban-C2500 3/4 Ton 2WD 5.7 L 350 CID V8
# 1998 Chevrolet Truck Express G3500 1 Ton - Van 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck Express G3500 1 Ton - Van 7.4 L 454 CID V8
# 1998 Chevrolet Truck Express G3500 1 Ton - Van 5.7 L 350 CID V8
# 1998 Chevrolet Truck Express G2500 3/4 Ton - Van 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck Express G2500 3/4 Ton - Van 5.7 L 350 CID V8
# 1998 Chevrolet Truck Express G2500 3/4 Ton - Van 5.0 L 305 CID V8
# 1998 Chevrolet Truck Express G2500 3/4 Ton - Van 4.3 L 262 CID V6
# 1998 Chevrolet Truck Express G1500 1/2 Ton - Van 5.7 L 350 CID V8
# 1998 Chevrolet Truck Express G1500 1/2 Ton - Van 5.0 L 305 CID V8
# 1998 Chevrolet Truck Express G1500 1/2 Ton - Van 4.3 L 262 CID V6
# 1998 Chevrolet Truck G30/3500 1 Ton - Van 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck G30/3500 1 Ton - Van 7.4 L 454 CID V8
# 1998 Chevrolet Truck G30/3500 1 Ton - Van 5.7 L 350 CID V8
# 1998 Chevrolet Truck G20/2500 3/4 Ton - Van 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck G20/2500 3/4 Ton - Van 5.7 L 350 CID V8
# 1998 Chevrolet Truck G20/2500 3/4 Ton - Van 5.0 L 305 CID V8
# 1998 Chevrolet Truck G20/2500 3/4 Ton - Van 4.3 L 262 CID V6
# 1998 Chevrolet Truck G10/1500 1/2 Ton - Van 5.7 L 350 CID V8
# 1998 Chevrolet Truck G10/1500 1/2 Ton - Van 5.0 L 305 CID V8
# 1998 Chevrolet Truck G10/1500 1/2 Ton - Van 4.3 L 262 CID V6
# 1998 Chevrolet Truck Suburban-C1500 1/2 Ton 2WD 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck Suburban-C1500 1/2 Ton 2WD 5.7 L 350 CID V8
# 1998 Chevrolet Truck K3500 1 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck K3500 1 Ton 4WD - Pickup 7.4 L 454 CID V8
# 1998 Chevrolet Truck K3500 1 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1998 Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 7.4 L 454 CID V8
# 1998 Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1998 Chevrolet Truck Astro Van 4.3 L 262 CID V6
# 1998 Chevrolet Truck C3500 1 Ton 2WD - Pickup 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck C3500 1 Ton 2WD - Pickup 7.4 L 454 CID V8
# 1998 Chevrolet Truck C3500 1 Ton 2WD - Pickup 5.7 L 350 CID V8
# 1998 Chevrolet Truck C3500 1 Ton 2WD - Pickup 4.3 L 262 CID V6
# 1998 Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1998 Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 5.0 L 305 CID V8
# 1998 Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 4.3 L 262 CID V6
# 1998 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 7.4 L 454 CID V8
# 1998 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 5.7 L 350 CID V8
# 1998 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 5.0 L 305 CID V8
# 1998 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 4.3 L 262 CID V6
# 1998 Chevrolet Truck C1500 1/2 Ton 2WD - Pickup 6.5 L 395 CID V8 Diesel
# 1998 Chevrolet Truck C1500 1/2 Ton 2WD - Pickup 5.7 L 350 CID V8
# 1998 Chevrolet Truck C1500 1/2 Ton 2WD - Pickup 5.0 L 305 CID V8
# 1998 Chevrolet Truck C1500 1/2 Ton 2WD - Pickup 4.3 L 262 CID V6
# 1998 Chevrolet Monte Carlo 3.8 L 231 CID V6
# 1998 Chevrolet Monte Carlo 3.1 L 189 CID V6
# 1998 Chevrolet Lumina 3.8 L 231 CID V6
# 1998 Chevrolet Lumina 3.1 L 189 CID V6
 

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Discussion Starter #4
Sorry all would not fit here's the last of the list:

1997
# 1997 GMC Truck Yukon-K1500 1/2 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1997 GMC Truck Yukon-K1500 1/2 Ton 4WD 5.7 L 350 CID V8
# 1997 GMC Truck Yukon-C1500 1/2 Ton 6.5 L 395 CID V8 Diesel
# 1997 GMC Truck Yukon-C1500 1/2 Ton 5.7 L 350 CID V8
# 1997 GMC Truck Suburban-K2500 3/4 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1997 GMC Truck Suburban-K2500 3/4 Ton 4WD 7.4 L 454 CID V8
# 1997 GMC Truck Suburban-K2500 3/4 Ton 4WD 5.7 L 350 CID V8
# 1997 GMC Truck Suburban-K1500 1/2 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1997 GMC Truck Suburban-K1500 1/2 Ton 4WD 5.7 L 350 CID V8
# 1997 GMC Truck Suburban-C2500 3/4 Ton 6.5 L 395 CID V8 Diesel
# 1997 GMC Truck Suburban-C2500 3/4 Ton 7.4 L 454 CID V8
# 1997 GMC Truck Suburban-C2500 3/4 Ton 5.7 L 350 CID V8
# 1997 GMC Truck Suburban-C1500 1/2 Ton 6.5 L 395 CID V8 Diesel
# 1997 GMC Truck Suburban-C1500 1/2 Ton 5.7 L 350 CID V8
# 1997 GMC Truck G3500 1 Ton Savana - Van 6.5 L 395 CID V8 Diesel
# 1997 GMC Truck G3500 1 Ton Savana - Van 7.4 L 454 CID V8
# 1997 GMC Truck G3500 1 Ton Savana - Van 5.7 L 350 CID V8
# 1997 GMC Truck G3500 1 Ton Savana - Van 4.3 L 262 CID V6
# 1997 GMC Truck G2500 3/4 Ton Savana - Van 6.5 L 395 CID V8 Diesel
# 1997 GMC Truck G2500 3/4 Ton Savana - Van 5.7 L 350 CID V8
# 1997 GMC Truck G2500 3/4 Ton Savana - Van 5.0 L 305 CID V8
# 1997 GMC Truck G2500 3/4 Ton Savana - Van 4.3 L 262 CID V6
# 1997 GMC Truck G1500 1/2 Ton Savana - Van 5.7 L 350 CID V8
# 1997 GMC Truck G1500 1/2 Ton Savana - Van 5.0 L 305 CID V8
# 1997 GMC Truck G1500 1/2 Ton Savana - Van 4.3 L 262 CID V6
# 1997 GMC Truck Safari - Cargo Mini Van 4.3 L 262 CID V6
# 1997 GMC Truck Safari - Passenger Mini Van 4.3 L 262 CID V6
# 1997 GMC Truck K3500 1 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1997 GMC Truck K3500 1 Ton 4WD - Pickup 7.4 L 454 CID V8
# 1997 GMC Truck K3500 1 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1997 GMC Truck K2500 3/4 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1997 GMC Truck K2500 3/4 Ton 4WD - Pickup 7.4 L 454 CID V8
# 1997 GMC Truck K2500 3/4 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1997 GMC Truck K2500 3/4 Ton 4WD - Pickup 5.0 L 305 CID V8
# 1997 GMC Truck K1500 1/2 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1997 GMC Truck K1500 1/2 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1997 GMC Truck K1500 1/2 Ton 4WD - Pickup 5.0 L 305 CID V8
# 1997 GMC Truck K1500 1/2 Ton 4WD - Pickup 4.3 L 262 CID V6
# 1997 GMC Truck C3500 1 Ton - Pickup 6.5 L 395 CID V8 Diesel
# 1997 GMC Truck C3500 1 Ton - Pickup 7.4 L 454 CID V8
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# 1997 GMC Truck C2500 3/4 Ton - Pickup 6.5 L 395 CID V8 Diesel
# 1997 GMC Truck C2500 3/4 Ton - Pickup 7.4 L 454 CID V8
# 1997 GMC Truck C2500 3/4 Ton - Pickup 5.7 L 350 CID V8
# 1997 GMC Truck C2500 3/4 Ton - Pickup 5.0 L 305 CID V8
# 1997 GMC Truck C2500 3/4 Ton - Pickup 4.3 L 262 CID V6
# 1997 GMC Truck C1500 1/2 Ton - Pickup 6.5 L 395 CID V8 Diesel
# 1997 GMC Truck C1500 1/2 Ton - Pickup 5.7 L 350 CID V8
# 1997 GMC Truck C1500 1/2 Ton - Pickup 5.0 L 305 CID V8
# 1997 GMC Truck C1500 1/2 Ton - Pickup 4.3 L 262 CID V6
# 1997 Chevrolet Truck Tahoe-K1500 1/2 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck Tahoe-K1500 1/2 Ton 4WD 5.7 L 350 CID V8
# 1997 Chevrolet Truck Tahoe-C1500 1/2 Ton 2WD 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck Tahoe-C1500 1/2 Ton 2WD 5.7 L 350 CID V8
# 1997 Chevrolet Truck Suburban-K2500 3/4 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck Suburban-K2500 3/4 Ton 4WD 7.4 L 454 CID V8
# 1997 Chevrolet Truck Suburban-K2500 3/4 Ton 4WD 5.7 L 350 CID V8
# 1997 Chevrolet Truck Suburban-K1500 1/2 Ton 4WD 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck Suburban-K1500 1/2 Ton 4WD 5.7 L 350 CID V8
# 1997 Chevrolet Truck Suburban-C2500 3/4 Ton 2WD 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck Suburban-C2500 3/4 Ton 2WD 7.4 L 454 CID V8
# 1997 Chevrolet Truck Suburban-C2500 3/4 Ton 2WD 5.7 L 350 CID V8
# 1997 Chevrolet Truck Express G3500 1 Ton - Van 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck Express G3500 1 Ton - Van 7.4 L 454 CID V8
# 1997 Chevrolet Truck Express G3500 1 Ton - Van 5.7 L 350 CID V8
# 1997 Chevrolet Truck Express G2500 3/4 Ton - Van 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck Express G2500 3/4 Ton - Van 5.7 L 350 CID V8
# 1997 Chevrolet Truck Express G2500 3/4 Ton - Van 5.0 L 305 CID V8
# 1997 Chevrolet Truck Express G2500 3/4 Ton - Van 4.3 L 262 CID V6
# 1997 Chevrolet Truck Express G1500 1/2 Ton - Van 5.7 L 350 CID V8
# 1997 Chevrolet Truck Express G1500 1/2 Ton - Van 5.0 L 305 CID V8
# 1997 Chevrolet Truck Express G1500 1/2 Ton - Van 4.3 L 262 CID V6
# 1997 Chevrolet Truck G30/3500 1 Ton - Van 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck G30/3500 1 Ton - Van 7.4 L 454 CID V8
# 1997 Chevrolet Truck G30/3500 1 Ton - Van 5.7 L 350 CID V8
# 1997 Chevrolet Truck G20/2500 3/4 Ton - Van 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck G20/2500 3/4 Ton - Van 5.7 L 350 CID V8
# 1997 Chevrolet Truck G20/2500 3/4 Ton - Van 5.0 L 305 CID V8
# 1997 Chevrolet Truck G20/2500 3/4 Ton - Van 4.3 L 262 CID V6
# 1997 Chevrolet Truck G10/1500 1/2 Ton - Van 5.7 L 350 CID V8
# 1997 Chevrolet Truck G10/1500 1/2 Ton - Van 5.0 L 305 CID V8
# 1997 Chevrolet Truck G10/1500 1/2 Ton - Van 4.3 L 262 CID V6
# 1997 Chevrolet Truck Suburban-C1500 1/2 Ton 2WD 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck Suburban-C1500 1/2 Ton 2WD 5.7 L 350 CID V8
# 1997 Chevrolet Truck K3500 1 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck K3500 1 Ton 4WD - Pickup 7.4 L 454 CID V8
# 1997 Chevrolet Truck K3500 1 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1997 Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 7.4 L 454 CID V8
# 1997 Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1997 Chevrolet Truck Astro Van 4.3 L 262 CID V6
# 1997 Chevrolet Truck C3500 1 Ton 2WD - Pickup 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck C3500 1 Ton 2WD - Pickup 7.4 L 454 CID V8
# 1997 Chevrolet Truck C3500 1 Ton 2WD - Pickup 5.7 L 350 CID V8
# 1997 Chevrolet Truck C3500 1 Ton 2WD - Pickup 4.3 L 262 CID V6
# 1997 Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 5.7 L 350 CID V8
# 1997 Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 5.0 L 305 CID V8
# 1997 Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 4.3 L 262 CID V6
# 1997 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 7.4 L 454 CID V8
# 1997 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 5.7 L 350 CID V8
# 1997 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 5.0 L 305 CID V8
# 1997 Chevrolet Truck C2500 3/4 Ton 2WD - Pickup 4.3 L 262 CID V6
# 1997 Chevrolet Truck C1500 1/2 Ton 2WD - Pickup 6.5 L 395 CID V8 Diesel
# 1997 Chevrolet Truck C1500 1/2 Ton 2WD - Pickup 5.7 L 350 CID V8
# 1997 Chevrolet Truck C1500 1/2 Ton 2WD - Pickup 5.0 L 305 CID V8
# 1997 Chevrolet Truck C1500 1/2 Ton 2WD - Pickup 4.3 L 262 CID V6
 

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Ed
This is a great post. One of the most informative posts I have seen on this forum. Thanks for all your time it took to put this together.
 

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Ed
This is a great post. One of the most informative posts I have seen on this forum. Thanks for all your time it took to put this together.
X2.

Know a couple of 'burban owners that have had to go through this and the mandatory:

1. IM gaskets
2. Fuel pump
3. pot metal heater hose fitting on IM
4. wiper motor
5. AC Delco battery post failure

*'95(?) - '99 body style. :)
 

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Discussion Starter #7
Awww shucks... twern't noth'n

Hey I appreciate your response and kind words ("x2" is a proper word, idn't?).

I know that when I get help from a forum that things are not always written for novice mechanics and often the instruction assumes the reader knows certain things. I know wordy postings seem verbose for many of us; but preparing the reader and would-be DIYer ahead of time will save frustration and anxiety and hopefully get a new mechanic another job-well-done in his tool box.

Give a man a fish, feed him for one day. Teach a man to fish and he'll be busy fishing instead of borrowing your Craftsman Torque Wrench and compressor.

Ed
 

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Discussion Starter #8
OK! I just have to give an update on this thread I posted a couple of weeks ago. It seems that with the current cold/wet snap we are having here in the Pacific NW, that the fix has been shortlived. The original problem as described is back. This is scary especially in the snow.

So, I have been looking for more answers to a longer term solution. Some of the threads I have read today are for later model Suburbans and Silverados experiencing, what sounds like, similar problems. The initial fix, as I understand, was to replace- under warranty, the intermediate section of the steering shaft. An addendum to the TSB outlining the procedure says that the dealer should forget about repolacing the part and use a lube kit that comes with a syringe full of lube (a moly equivalent as I understand it).

I am still hot on the trail of the fix, as I am not up for replacing the "Steering Speed Sensor" every two weeks. I have already made a formal complaint with the NTSB. I have heard a couple of guys say "why b*tch?- its just a worn out part... replace it already". I have and it's tendency to wear this quickly tells me that it is more than just a normally wearing component.

I can only guess why it worked immediately; but now does not. I am thinking that the copper/brass bushings inside of the ring (of the sensor) initially contact the shaft and all is well. After a while; however, the tabs lose connectivity with the metal of the shaft. The sensor-on-shaft fitment was very tight, tolerance wise, so I suspect that there is an issue between the shaft meta (looks like galvanized)l and the copper of the sensor. I wonder if the two metals are having galvanic response action like plumbing pipes get- galvanized in contact with copper?

Other wise I plan on pulling the sensor. Cleaning the copper tabs/bushings on the sensor. Degreasing the shaft. Sanding the shaft for new metal. Possibly lubing with molycoat or dielectric grease and putting the sensor back in.

Any ideas?

Thanks,

Ed
 

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Discussion Starter #9
OK, forget that last post where I discuss galvanic reaction between the shaft and the copper on the steering sensor. I jus got back from NAPA parts. I bought a new Steering sensor an carefully disasembled it/ The inner copper ring that grips the steering column shaft actually does not have any contact to the inner electronics. So that blows the galvanic theory.

I can still only make a few assumptions because I have not found a way to make any tests that would define the solution... yet. Having said that I have a couple of hypotenuse' (that means educated guesses). Inside of the sensor are two tracks that are connected to the pigtail. They serve to determine the speed of the steering shaft as you turn the wheel. The inner ring of the sensor that slips over the steering shaft has a split bushing that monitors you turning the wheel and relays the speed info to the outer ring of the sensor. The bushing is a fragile part that is basically a bent piece of zinc plated tin. They are bent just enough to load up and stay pressed against the inner track they ride on. According to the last TSB from GM regarding this part failure The problem you experience with sudden "ice Patch" jerkiness while turning, is attributed to the bushing riding on the track- they seem to come off the tracks just enogh to lose contact momentarily at certain places in the turning of the steering wheel. The TSB was not too specific; but that seem to be the issue. If the bushing that rides on the tracks were more substantial and were designed to positively stay "on track" as it were. This problem would not present itself. The only other problem I can figure may be the culprit is the copper ring that actually makes contact with the steering shaft. This inner ring is the same one I suspected was losing contact with the steering shaft- found out that it's ONLY job it to center the sensor and grip the shaft tightly so that it rotates when the steering wheel is turned. There are teeth on this ring that are meant to take a firm bite on the shaft. If these teeth are not positivly gripping the shaft, then they will skip along the circumfrence of the shaft-bite-slip-bite. This will give bad data to the computer that monitors the speed sensor and would cause the "ice patch" problem.

I have bent the contact bushings up 2/32 ds higher as they were just barely contacting the tracks they need to. To keep them from relaxing over time. I glued a small section from a wooden match under them to keep them stout. This would settle the first issue.

The Tabs that may be failing to bite into the sensor... I will rebend them. Alternately biting with the left edge on this one, and the right edge on the next. I let you know how I make out.

Geez, with all the GM produts out their using this sensor, you think they would get the part reworked.

Ed



Just kidding I know what a hypotenuse is
[/IMG]
 

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I tried a fix that I found on another forum. I just wd-40'd the sensor and it went back to work. we'll see how long that lasts. I suspect within a few thousand miles I'll be under the dash again putting in a new one. THis one has made it 175,00 miles, so I should be happy with replacing it.

Any chance that the failure of this sensor could cause the pump to spike high pressure and blow the hose off the swaged fitting?? I have had that happen a couple of times over the course of 18 months.

Carl
 

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Discussion Starter #11
Carl,

Wow, the hose blew off?.....More than once? What end blew? If this is caused by the sensor temporarily losing it's continuity, this sounds like a good time to invest in a spare hose wrapped with the wrenches needed to r/r the the hoses. You cannot field repair hydraulics and I am all too often in the sticks not to have a back-up plan.

Since my last posting, I have had to dig the last replacement from NAPA out and replace it with an OEM from Chevy. The Parts Guy said it was a newer part number; But only a couple of weeks after I replaced it, I have noticed a little clunky slop. It is not as bad as it was before and I am just hoping it does not get worse. The repair, now, is about as tuff as installing a set of disc pads; but I'd still rather not have to do it 2- times a year.

After analyzing the problem a little more, I believe that the culprit is the tiny copper tabs tha extend fron the inner moving hub of the part in question, to the stationary ring that is locked around the steering shaft. It seems that when the steering wheel is turned primarily from 12 o'clock to or past the 10:30 or 1:30 position, that a certain torquing or flexation occurs in the shaft at the point where the part is installed. The bending here lifts the connectors momentarily off track causing the hiccup. A new design is warranted; but won't happen by GM nor in the after market.

I drive my sons 76 Camaro and the steering response is more than rack-and-pinion scary; which may be too much?!? careful what you wish for?


Ed
 

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The hose blew on the end that goes into the steering valve as I recall. I think it its more likely a faulty relief valve (I assume there is on somewhere in the system. I guess you can drive it with the hose blown. you would likely trash the PS pump though.

My WD 40 fix lasted about a day....now back to sluggish steering. I will probably have to break down and buy a new sensor.

Carl
 

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I bought the Napa sensor. Installed it and drove about 2k miles without any trouble yet. My steering was really loose it felt like I was chasing the truck down the road.
 

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Guys, is this not a result of your idler arm being mounted in single sheer and allowing it to deflect when truning? it is a wear item as well...

Google cognito motorsports, they make an external brace for double sheer and more lateral support...Thats my plan!
 

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Subscribed. This is hopefully going to help me tremendously. The previous owner replaced the steering box 6 months ago. I was completely perplexed as to why the steering feels so loose and unresponsive.
 

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I am having similar issues with a 1997 GMC Suburban. I have ordered a Dorman sensor prior to finding this thread. I am not a mechanic, only a parts replacer, but found a possible way to test the part to see if it is defective. Hope this helps.
 

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The problem: The steering on the vehicles that utilize this part slowly gets less responsive, feeling a little like a worn rag joint and a little like the steering box is in need of a fine tuning, or worse replacement. It starts a little at a time and worsens to the point where it feels as if, while making a turn, your front wheels have both slipped sideways -as if you have just hit a small patch of black ice.The front end suddenly sideslips; but not to the point where you lose any real control. It is more like feeling a very strong crosswind on the freeway.

You will also start to feel as though your steering linkage has become loose- you get the feeling as though the pitman arm that controls the rest of the steering linkage has a couple inches of slop in it that only shows up when coming off of a direct straight-ahead course. Most turns of the wheel- noticably between the 11 'oclock and 1 'oclock position, become from clicky at first to clunky, if not fixed.

The details: The problem is all to often a part on the steering shaft that is known as the "steering Speed Sensor"
It is mostly a dealer chevy part and even www.gmpartsclub.com and their ilk may run 60-75 bucks. The discounters usually make up on the low price with absorbatent shipping. The GM part number is 26064468. Many references to this part are made as "the EVO" You'll get further faster with the parts guy by saying "steering Speed Sensor". AFter searching and finding it at 1A auto.com for 27.95. I lit up only to see that they were out of stock. More searching turned up a replacement at NAPA Auto Parts p/n BK 620-2250- go pick one up for 35.99- can you stand it?

Installation: Tools: get a small bright flash light, a medium length "prying thickness screwdriver, household weight hammer- not too big-no room, a shop towel, a medium length 15mm socket/ratchet wrench. Comfy clothes that you can move upsidedown in.

The removal/replacement. Time 20-30 minutes. Near the bottom quarter of the steering shaft- under the dashboard, you'll find a cast metal collar that belongs to the steering shaft that passes through the firewall and connects to the steering column in the vehicle. A plastic ring circles the shaft above it. This is where you'll be working. Before disconnecting the neg battery terminal at the battery, watch the shaft from under the dash. With the key in place to unlock the steering- you may have to start the car, turn the steering wheel until the nut on the steering shaft can be easily accessed with a socket wrench. Turn the wheel back and forth to relax the wheel in this position, then remove the key from the column- locking the wheel in this position. Now disconnect the neg battery lug from the battery.

Remove the nut from the shaft- Don't confuse this nut/bolt with the two bolts holding the steering column to the frame. Use the hammer and screwdriver to tap the bolt upwards and free of the column.

The lower shaft must now be pulled a few inched back about 4-5, to allow removal of the old sensor. Use the hammer handle to slowly massage the cast collar back towards the hole in the firewall on the lower end of the shaft. It will take some effort; but work slow so as not to break the collar with the hammer. This seems like it would be easier in warm weather; it was cold where I live. Once the collar is completely free of the upper shaft spline you can remove the old sensor.

The chevy sensor is held inside of the visible plastic ring by 3 tabs- the kind that always break when you try to pull a connector out on a wiring job. The tabs are evenly spaced around the ring. There are slits next to each tab that you can put a very tiny screw driver in to dig the sensor out as the tabs are held back. I used some sharp point exacto blades as wedges and the sensor popped out as each of the tabs were pulled back. Once the sensor is free you need to disconnect the connector of the sensor's pigtail. It is a single connector with three wires. Note the routing of the wire and the look of the sensor's side that faces up toward the steering wheel. Slip the sensor off of the shaft. Use the screwdriver to pry the cast collar aside to make room for the sensor to come off, and again for the new sensor to be slipped on the shaft.

Connect the new sensor to the wiring connector before threading the sensor over the shaft. When the new sensor is on the shaft rock it gently upwards until it slides into place. The base of the new sensor's pigtail slips into a notch on the housing. Once aligned, the sensor can be seated past the 3 locking tabs. It is important to seat the sensor into the housing completely without damaging the center bearing assembly.

Button it up. The collar on the lower steering shaft must now be brought back in to slide up onto the shaft. This is the hard part- but only moderately so. By unlocking the steering wheel again and turning the shaft to match the collar assembly, a little massaging will get the collar on the shaft enough for you to start tapping the collar upward with the hammer. Do this until you see the bolt holes realign. Slip the bolt in from above. Start and tighen the nut to about 44 lbs. There is a rubber collar over the lower steering shaft on the engine side of the firewall. It seems to reseat itself; but check that it is in place.

Test drive.

This is one of the few elctronic parts that have truly felt as if there was a breakdown of the mechanical parts. Complete with clunking and bumping. You will save a lot by doing this yourself, before you have it diagnosed as a big, and possibly unnecessary repair. Good luck.
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EdPDX
Ed, The reason the sensor went bad is due to that lower steering column bearing has failed. I found a thread which explained this so I went to my truck and sure enough the bearing wobbled all over the place. check that bearing.
 

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OK, forget that last post where I discuss galvanic reaction between the shaft and the copper on the steering sensor. I jus got back from NAPA parts. I bought a new Steering sensor an carefully disasembled it/ The inner copper ring that grips the steering column shaft actually does not have any contact to the inner electronics. So that blows the galvanic theory.

I can still only make a few assumptions because I have not found a way to make any tests that would define the solution... yet. Having said that I have a couple of hypotenuse' (that means educated guesses). Inside of the sensor are two tracks that are connected to the pigtail. They serve to determine the speed of the steering shaft as you turn the wheel. The inner ring of the sensor that slips over the steering shaft has a split bushing that monitors you turning the wheel and relays the speed info to the outer ring of the sensor. The bushing is a fragile part that is basically a bent piece of zinc plated tin. They are bent just enough to load up and stay pressed against the inner track they ride on. According to the last TSB from GM regarding this part failure The problem you experience with sudden "ice Patch" jerkiness while turning, is attributed to the bushing riding on the track- they seem to come off the tracks just enogh to lose contact momentarily at certain places in the turning of the steering wheel. The TSB was not too specific; but that seem to be the issue. If the bushing that rides on the tracks were more substantial and were designed to positively stay "on track" as it were. This problem would not present itself. The only other problem I can figure may be the culprit is the copper ring that actually makes contact with the steering shaft. This inner ring is the same one I suspected was losing contact with the steering shaft- found out that it's ONLY job it to center the sensor and grip the shaft tightly so that it rotates when the steering wheel is turned. There are teeth on this ring that are meant to take a firm bite on the shaft. If these teeth are not positivly gripping the shaft, then they will skip along the circumfrence of the shaft-bite-slip-bite. This will give bad data to the computer that monitors the speed sensor and would cause the "ice patch" problem.

I have bent the contact bushings up 2/32 ds higher as they were just barely contacting the tracks they need to. To keep them from relaxing over time. I glued a small section from a wooden match under them to keep them stout. This would settle the first issue.

The Tabs that may be failing to bite into the sensor... I will rebend them. Alternately biting with the left edge on this one, and the right edge on the next. I let you know how I make out.

Geez, with all the GM produts out their using this sensor, you think they would get the part reworked.

Ed



Just kidding I know what a hypotenuse is
[/IMG]
what you just said seems to relate to a failing bearing, it allows the steering shaft to ocellate causing that $99.00 part to be gutted.
 
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