Question about 1992 GMC Sierra

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Transmission Issue I own a 1992 GMC Sierra ext cab. My transmission seems to work as long as I am going up hill but when I pull onto flat land it does not catch and it leaves me to have to push it back down hill. The problem started when I was pulling my trailer and was backing it into the drive way. There was a cap located on the leftside of the tranny that popped off. I noticed that it had silicone all around the edges. I cleaned the old silicon off and put on some new silicone then put it back on. I just can't figure out why it works going up and down hill but the minute I get on level land it stalls out.

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Is the fluid level ok, was the governer still in place when the gov cap popped off, have you dropped the trans pan to see if the filter popped out and is it possible that you only get enough fluid to the pump pickup when on a hill?? just a few ideas

Posted on Aug 22, 2008


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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!

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