The other day I was cruising down my street when I saw something and decided to back up and go down a dirt drive. I have a 78 FJ40 with a Detroit in the rear. I backed up and when I clutched and coasted while braking a big bang came from the rear. This Detroit has been in this truck for about 5 years and has been pretty quiet so far. A little ratcheting in corners but doesn't load up and bang like my lock rite used to. I was driving the truck Sunday and several times while driving straight down the road at about 45mph I felt a hesitation or like a gear didn't want to mesh right. Almost like a binding. Any ideas? Thanks!