I've got a 72 347 stroker grabber with a c4 and a posi. Intermittently my transmission won't engage in drive I'll put it a drive and it will just be neutralized out of the blue after anywhere from 1 to 20 minutes it will engage a drive and I can drive it all day long no slippage no problems with driving it after it engages no material in the pan valve bodies tight transmission fluid is full any leads would be great
