Hey, I just got done tearing down my tranny, with the help of a pretty experienced guy from tech.. My reverse would not engage.. we finished taking it out and taking apart the tranny in one night, we just have to put it back in today..

All we had to do was 5th/reverse, which is at the very top of the main shaft..

are you grinding much in other gears? check your master/slave cylinder.. might be low on fluid..

Yea I use penzoil synchromesh, I heard it was the same as the GM stuff, just rebadged.. only penzoil product I will ever use.. haha