This heavy-duty differential is recommended for any high performance road Mini or Mini Cooper. A standard Mini differential has only one pin and one pair of spider gears. This improved diff has a hard steel case and two pins with four spider gears to handle increased power without wearing or failing prematurely. Includes 3.10 final drive the best choice for today’s modern highways where speeds of 65-75mph are necessary to keep up with traffic. Includes ARP hardware differential bearings, output shafts. This entire differential and final drive assembly is professionally pre-assembled and ready to install.