A complete gear package with everything you need to install gears in your 8.8" rearend. Gears are from Ford Racing - by far the easiest gears to set up. Our kit includes the gears, pinion nut, crush sleeve, pinion shims, pinion bearing and Mobil 1 Synthetic fluid. 4.10 gears are aggressive for street cars although lots of 96+ Cobra and 05+ Mustang owners love 'em all the time.