Call Bill Boudreau the ZF6 Doc:
http://www.zfdoc.com/
(602) 319-6575
You've got serious issues that need to be dealt with. The C Beam being buckled is a big red sign that something drastic has happened to your drivetrain.
Drop me a PM if you decide to replace the ZF6, I've got a list of contacts that I put together when I went looking for my replacement ZF6.
TomC