I'm inclined to believe transmission related as stated above. The code would probably be helpful in diagnosis if it was accessible. If the PCM is fried, it could also start firing shift solenoids at the wrong times and really cause some damage. I'd take care of that before moving any further or even driving the car.
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Artie
73 Camaro 25.3 build TT LS in progress
67 Camaro
99 T/A
Other crap not worth mentioning
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