The most common cause is a faulty speed sensor on the transmission.
SOURCE: 1997 Chevrolet Silverado Fuel System
Hello Johnholley
I am wondering do you hear the fuel pump when you just turn the key into the on run position not crank just in run and listen and see if you hear the fuel pump run for a second, If you don't hear it you will want to check for power at the fuel tank, and have some one cycle the key while your under the truck with a test light. Hopefully you have power and you hear the fuel pump run. Now if you do hear the fuel pump running then the next thing you will want to check is for spark, It could be the ignition module or pickup coil. check out those thing and I am sure you will be able to figure out whats going on. If you don't get back to me and we can try a few other methods. I sure hope that helps you out johnholley. and thanks for using Fix Ya Bear001
SOURCE: 1995 GMC Siera Truck Transmission
i gather its an auto transmission ,which mean your loosing oil pressure from the convertor inside the tranny housing.
SOURCE: Truck will ot shift and speedometer stopped working too
Have somebody check for trouble codes.Look for possible speed sensor codes.The speed sensor is a input to both trans and abs.
SOURCE: 1995 ford taurus no speedometer, abs light, won't shift correctly
speed sensor needs replaced
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