The 6 lug 5.5" pattern rear diff from my 1967 C10 has a center wheel hub of 4.25" or 108mm which is the same as 6 lug 1988 / 1998 C1500 - C2500 with 1 1/4" rotors or GVW 7200 vehicles. The rear axle housing comes with drums, 3" tubes and has many rear disc kits on the market if desired. The width of the housing from flange to flange is 75" and the axles add 3 inches extra together. This is a GM 12 bolt Truck axle. This is called a "Corporate differential that currently has a series 4 Eaton clutch type limited slip that uses ring & pinions from 3.48 up. This one is a 4.11 ratio. The other axle was Dana. The pan-hard bar pin is bolted in a cast flange and includes welded flanges for spring loaded lower control arms. An online research show that diff was used for years in dozens of models. I am in Omaha and the diff is heavy and would sell / needs serviced / clutches are good. The GM paper service books have a tech test the limited slip by using a flange bolted to the wheel lugs, then with a torque wrench, test the break-loose point.
Cars = 48/55 ft. lbs. Truck = 68/75 ft. lbs. Yet I have a diff spreader for servicing the guts. Retired ASE Master Tech.
