Question about 1995 Chevrolet C/K 2500

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Chevy Transmission I bought a 3 Speed Overdrive Transmission and had it installed and from the git-go had a problem. It shifts out of 1st into 2nd and no matter what the RPM Range will not shift any further. It seems to stay in 2nd. From what I was told, Chevy used a Allison Transmission for their 2500 Series 4WDs. I have checked in the Chilton Manual and they refer to the posibility of an adjustment to the Throttle Valve (TV) cable. I've tried everything else to rectify the problem. Could this be the culpert?

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  • Carl Duke
    Carl Duke Nov 16, 2008

    I can run the computer codes and the (1st) Code read 71 which indicates the VSS and 72 which isn't on the general Code Diognostic. I disconnect the Neg. Terminal for a reset and it shifts perfect. It was started and ran the next day and went back to the problem, 1st to 2nd and no further. I disconnected the Neg. cable once more and cleared it and it ran the codes and it only came up with the code 72. I would like to know what this code indicates. It ran perfect again after clearing the 72 code and I haven't driven it since.

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For a dammed manual and dont be such a lazy driver .try the vacumn pipe that runs from the inlet manifold to the gearbox as this is what makes the older cars change gear till the introduction of electronics with more to go wrong.the cable mentioned should just pull the lever on box as when the throttle is on maximum,if its pulling too early then it would be a late change but it would still change.if all the above checks out then fault is in box either the brain has a blockage or a dodgy valve or most likely the brake band needs replacing.

Posted on Nov 12, 2008

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  • Chevrolet Master
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Yes it could be the issue, adjust it by the book and recheck, is the transmission the same year as the truck, they make many changes these days, this can cause issues due to the computer control calibration may be incorrect for this used transmission.

Posted on Nov 12, 2008

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