These center differential towers are stronger and much easier to disassemble for maintenance. These are split in the center so no more flipping the truck to get to the bottom screws to remove the center differential. Remove 4 screws from the top and the whole differential come out. Very Easy!! These will work with the stock plastic gear cover. These are CNC machined from aircraft grade billet aluminum. ****New Addition to towers - Locking set-screw designed to make brakes more adjustable and secure brake mounting screws in position.