the rears never locked up.
and I was going to switch to disc in the back too. got the kit, but waiting on a sure grip before I rip the rear apart for the kit.

so I figured I could wait and see if I needed it after that.
plus I have one from a 68 sitting in the garage, but the mix of chevy master cylinder and such seemed to screw me up, so I would need new lines. it just kept snowballing, so I never got around to it.