Just an update. The ARB was replaced with a Detroit TruTrac. The shim work was done by me and my buddy Nate. As I suspected the PO remounted the ring and pinion with new parts before he sold it to me. The ARB was trashed and scrapped. Axel housing was in great shape, shafts were good, c clips were undamaged. I am now plugging the housing where all of the old locker hoses and piping used to run and I am capping off the compressed air tree for the rear locker feed. My wheels are now unlocked and she is driving great. Thanks to all of you who gave me advice and guidance.
NAVY STRONG, TEXAS PROUD