by 
mario444
ANSWERS: 2
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Automatic? Year? Assuming automatic transmission with a floor stick to move from 2 wheel to 4 wheel drive. Usually the transmission is directly under the floor board under where the floor stick shift is. It is possible that pins or other pieces of the assemble are warped, broken, have slipped twisted, blah. Also there may be a few screws loose. That should be a shift problem, not a problem with the transmission. Due to its location the shifter is readily kicked, and just general travel can knock things loose. My 77 Burb has to be tightened every so often as matter of course. If that doesn't solve the problem then it could be an issue inside the transmission itself. Insufficient data for more reply here, so take it to a transmission specialist.
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I had the same problem with my 2002 S10. I disconnected the battery for about 1 min. and the module reset itselfl.
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