91rsinnm

hey people, I just finished swapping in another 305 since the one that was in took a crap. everything is mostly a go except that when the car is off, you can shift into reverse, but once the car is running, it wont let you shift into reverse.. it just grinds while you try and shove it in. I just remembered that there were i think 2 connectors from the harness that still need to be plugged in. could that be causing the reverse issue.. or any other ideas.. all the other gears go in smooth.