4L60e neutralizing...?
ALSO
When in reverse, it will back up at idle UNLESS on an incline...
if you give it throttle it will start to "slip" and when you give it ALOT of throttle it will engage and blow the tires off....!
What do you think?
BTW... it shifts very hard and firm!
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On reverse I would have to say theres a sealing or clutch issue with the low/reverse or reverse input clutch, In any case you will be rebuilding or replacing the trans I am afraid.








