I have a 4L80E in my work truck.(01 3500hd 8.1L gas) Everything is working except for reverse. Fluid level is good. It is a little dark, but not terrible. This just happened, as in, this morning it worked, and right now it does not. You can put the selector into revers, and it just free revs like it is in neutral. any ideas? Any help is greatly appreciated.

 

someone had that same problem before..i think it was electrical....

 

negative....same thing happend to Blown364.....needed a rebuild.

 

The first thing I would check is the reverse servo piston, they are known for cracking on later model units and will give you a no reverse condition. You can access the reverse servo piston by dropping the pan and valvebody.

Chuck

 

Yeah it'll probably need a rebuild, happened to someone i know and the sunshell was busted along with some other parts i dont remember..