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Hi All, noob to this forum, and I have a BIG Tahoe Problems

2295 Views 9 Replies 9 Participants Last post by  SPXTrader, 
S
I've owned my 96 Tahoe since late 97. 4X4, 4 door, 90,000 miles, 4" SuperLift, BFG 33X10.5 AT tires. On a trip last weekend, the thing started vibrating like mad. Here's a quick list:

up to 59 MPH OK
60 to 69 MPH BAD vibration. Things are blurry in the rear view mirror. A sound and feel like you're driving on the rumble strips on the side of the interstate.
70 and above Slight vibration.

Since it was a long drive, I had time to mess with speed/RPM. In the 60 to 69 MPH range, slight pressure on the gas seemed to lower it a bit, but it was still bad. Going downhill, at the same speeds, off the gas 100% and once the tach dropped below about 1700, it stopped. Smooth as silk.

This happened all of a sudden. Three weeks ago and another long drive, no problems. I've checked the u-joints and they are tight. No drive shaft play. This happens in OD or when it down shifts for a uphill pull.

Has anyone experienced this? Suggestions as to what to check?

Any and all replies will be appreciated!
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S
I'm going to second the thought of checking your rear-end.
I had a Jeep that did the same thing. I pulled the diff cover off and a tooth from the pinion fell out. Well, a good chunk of one.
It vibrated at speed really bad, but no clunking or anything like that.
If I were you, I'd start by just checking all your wheels for any wheel weight marks..fresh marks from where one could have gotten thrown. Tire pressures. then drop the driveshaft and check the play on the pinion shaft. it should be next to nothing. Then drop the fluid. Even if nothing is in there, fresh oil won't hurt and you'll know where you stand after 90k...
good luck. I'll keep my fingers crossed for you that its something simple like a tossed weight.
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