9.25 rear diff

Could be a bearing. Nevertheless, here's the specs for the 9.25" The good news is that these rears are plentiful at the boneyards.

Assembly Specifications:
# Cover Bolt Ft. Lbs. 15-25
# Pinion Brg. Preload In. Lbs 10-20
# Pinion Brg. Preload In. Lbs Used 10-15
# Ring Gear Backlash .005-.008
# Ring Gear Bolt to case Ft. Lbs. 115
# Side Brg. Caps Ft. Lbs. 100