[rowekmr]

Hello Group,

I just bought a 96 Suburban 2500 4x4 with 7.4L with 138K miles and was making a list of preventive maintenance and wanted some input from the experienced ones. It will be a part time tow vehicle for my 31' travel trailer. The a/c blows warm so I am hoping it just needs freon but I have noticed that the electric fan in front doesn't come on when I turn on the a/c and neither the a/c compressor. It has a slight leak under the front differential so besides getting that fixed I wanted to get the front and rear diff fluid changed.

Oil change
Trans flush
Brake fluid flush
Engine coolant flush
Possible power steering fluid flush (if recommended here) since it also provides pressure for my brake system
spark plugs, cap/rotor possibly wires and PCV valve
Sea foam in tank possible some in oil pan and in PCV valve hose (not sure)
Cleaning of the TB and IAC with carb cleaner
Mass Air cleaned with the spray on and dry mass air cleaner (not carb cleaner)

 

[silveradotrailblazer]

Don't use carb cleaner to clean the throttlebody. Use a throttlebody cleaner. The t/body has a coating on it that carb cleaner can damage/remove. I like CRC , 3M or Seafoam to clean the throttlebody. Seafoam has a new spray can with a tube to clean he intake manifold. Its shown on the Seafoam website. Also don't forget the fuel filter. Most people on this site including myself use A/C Delco spark plugs, Gm's just seem to run better with the A/C Delco's.

 

[racekid91]

Not totally sure if I'd recommend flushing the transmission. Possible to cause more problems if you flush it. For example, if you have metal shavings, you'll throw them around instead of them sitting in the transmission pan. Just a thought, something I've learned from some of the older, more experienced tech's at work.

Also, a good idea would be drain and fill your transfer case, and differentials. Rear diff, I'd replace the cover gasket. Front just drain and fill

 

[Crispyt]

x2 on what racekid said. Although if your talking about dropping the pan and changing the filter it probably wont be a problem. If your totaly flushing the entire transmisson you may notice problems and it can also cause your transmission to shift hard and slip a little. This is because the abrasive material that wears off the clutch packs helps to work as a friction material and without it in the fluid your transmission may slip for awhile. If you do flush it you should put an aditive in it to help it stop slipping. I know that lucas makes a decent one and I think Bars also does. I know the lucas one works pretty decent because I have people come in to work a lot explaning how they flushed there system and then it slipped. I recomend they use the lucas stuff and they said that it has helped a lot.

Also check your wheel bearings, balls joints, tie-rod ends, shock absorbers, ect...

 

[kcb37]

Basic run down.
Do not flush anything period. More then likely your trans will not slip if flushed, it will slip for the first day and quit completely if it lasts that long.
Just drop the pan change the filter and refill.
Drain and refill the coolant. Do so about once every 2 years.
Use a Turkey baster to suck the dirty brake fluid out of the master cly, refill. Do so until you get clear fluid out. Then bleed the brakes.
Power steering, pull a line off the gear box, truck off turn the wheel. This will push fluid out of the gear box getting more. (with hydroboost you will not get it all) Then fill the pump, with the tires off the ground truck off, turn the wheel, add fluid as needed. This should get most of the air out.
Diffs also change the fluid.
Check the plugs, wires, distributor cap and rotor.
Check the battery, cables, starter and alt. Make sure all cables are tight, mounting is tight, etc..
Check the fan belt.
Check the brakes. The caliper bolts need taken out, cleaned and a light coat of only brake grease put on them.
The battery should also be charge about once a month with a desulfating charger.