Transmission not shifting

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98 Chevy k1500 I know these transmission’s can be a pain….. what would make it not shift I do have some codes any advice would be helpful and thanks
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1997

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the P0740 was just solved with an ignition switch replacement ...


maybe post up some symptoms see what else shakes out.
 

Schurkey

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Based on those codes, I bet the trans won't shift because it's in "Limp Home" mode. Stuck in 3rd gear?

Clear the codes, see what comes back. Follow the diagnostic procedures in the service manual for those codes, unless you can find a service bulletin that applies.

If you fix one or two codes...you maybe fix all the rest at the same time (common cause.)
 
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