Hey I have a 2009 Chevy Express that won't go in reverse.. I've been doing some research and before committing to needing a new transmission, and it seems like there's a ~common~ issue with the 4L80E transmission where the reverse servo stops engaging after a while. Another check I've seen to do is to put it in 1st gear and listen/feel as it coasts for lack of "engine braking." Has anyone else had any experience with this?