Question about 1994 GMC Sierra

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1994 GMC transmission problem

I have a 1994 GMC 2500 Sierra 4x4 V8 6:5 litre diesel automatic. The transmission has a problem. When in drive it appears to jump a tooth in the transfer box, or something similar. When driving along it sounds like the gearbox (or transfer box) binds up and then lets go with a bang through the range change lever. There is no obvious pattern to this problem. It seems to happen more when cruising under a moderate load. It does not seem to happen when travelling down a slope under a light loading or when under a heavy load such as a hill climb. When it happens it sounds very bad and makes the range change lever jump severally. I have checked out the front diff and can confirm that it is not caused in any way by this. Any help would be greatly recieved. Regards, Les

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SOURCE: GMC Vandura 1983 6.2 litre diesel automatic transmission oil GMC Vandura 1983 6.2 litre diesel automatic

Your dip stick tube is your fill tube for your transmission . Make sure your transmission oil is at opperating temp before servicing some instructions are written on the dip stick , Use a small funnel , Add a little at a time (cup). Use the proper fluid , check regularly

Posted on May 18, 2008

  • 2 Answers

SOURCE: 2008 GMC 2500 Sierra - Change factory tire pressure setting

Let me understand this.. I ask you guy's a question and before you send me the answer, you want to charge me. Then you ask if I resolved the problem and if so, tell you how I did it. Well I did resolve it and I would be more than happy to tell you how. $29.95 with get my detailed response.

Posted on Feb 16, 2009

SOURCE: 2001 GMC SIERRA C-1500 automatic TRANSMISSION problem

Check transmission lock up selenoid.

Posted on Jul 16, 2009

  • 3 Answers

SOURCE: Vibration

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

  • 1 Answer

SOURCE: Can I make this 4x4 a 2x4 for now?

if the only problem was stuck in 4x4 would not be huge deal. You could just pull the driveshaft off the front. But with it stuck in low range not sure that you can get away with doing that.

Posted on May 26, 2010

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