Id imagine it may have been the PO installing a new pinion seal??? and not remembering to retighten it. I bet it wouldnt be to hard to get the info and pull the back cover and check the backlash and ring/pinion contact and then youd know for sure whether or not youd need to tear into and rebuild the rear.

Let us know what you find and plan on doing!

Jeff


My 1953 Chevrolet
1947.1 Gallery
1972 C-10 1/2 Ton & 1972 C-30 1 Ton