Mag-Hytec Rear Differential Cover Full floating Axle GM 1973 to present 2500 & 3500 not all w/ 14-10.5 axle Overall height 3 1/2" Capacity: 6 Quarts Includes: Bolt kit, Drain Plug and Dip Stick. Must check to confirm Full Floating Axle Ring gear on passengers side of center 6 Liter Gas 2500 HD Must Visually confirm, some have #GM 14-9.5