Question about 1992 GMC Sierra

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Vibration I am having a few issues with my 1992 GMC Sierra 3/4 ton. It is a 3/4 ton extended cab short box with a 350 engine and 2 piece drive shaft. Not sure what type of transmission but it is an automatic with overdrive. One problem I have is when I pull out onto the highway and "floor it", the transmission does not always shift correctly and will RPM's will redline. When this happens I need to backoff on the throttle as it will not shift on it's own. The other problem I have is a vibration issue. When the engine is under load at highway speeds, usually around 2000 RPM's, I get a vibration that seems to be comming from the drivetrain. I have replaced the ujoints, but did not change the steady bearing as it seemed to be OK. There is also some leaking from the transmission. If I accelerate quickly there is never a vibration, it only happens if I slowly accelerate and it almost feels like the engine is "lugging". The speed can be anywhere between 80 to 110 kph. If I shift from overdrive to drive, it does not happen as aften but if I am travelling at a constant speed and need to increase the throttle slightly, typically when starting to go up a hill, I will get the vibration. There is also a slight vibration at very slow speeds that seems to come from the agressive tread of the tires but is seems like a different type of vibration. There is 230,000 KM on the truck. I am due for a transmission service and will definitely require a fluid change and a new filter but I do not want to spend the money if the transmission may be failing. Hope you have some ideas. Thanks Bill C

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Your highway acceleration problem could be a coil problem. Not sure if that year of chev has coil packs or not but experienced same thing with ford 5.4L. went through 3 coil packs and did the same thing each time before biting the dust. Transmission seems to be sticking on the 1to2 upshift and could be a sticking solenoid in the valve body of the tranny. If the shifting problem persists then the tranny deffinately has to be rebuilt. It's made it quite far if tha is the original tranny, you cant expect too much life out of it if it has been worked hard. I highly doubt a fluid change would help at all. Or if you want, you can buy a can of new truck from GM for about 25 to 35 thousand bucks! Typically works great!

Posted on Oct 19, 2009

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The vibration may not neccessarily be coming from the transmission,sometimes when the cooling fan clutch bearings go bad it will vibrate as well,is the fan seem loose?But,that truck has a 700r4 transmission and ive heard of alot of them with mileage over 130,000 MILES shifting weird and\or losing overdrive.

Posted on Apr 23, 2009

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I had a dodge ram 2500, which only had a 1/2 ton capacity.
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