Front and rear differentials from 1979 Chevy 1/2 ton. Sold as pair only. They were completely re-built 14,390 miles ago, but removed to put 411 gears in the truck. Rear is 12 bolt with 373 Yukon gears, with new axles and brakes. Both have new carrier assemblies. PLEASE, phone calls only. Will not reply to texts. Will not reply to "is this still available". If it's posted, it's available.