For the fast gear set, kit ratio are: 33/21, 35/21. The first gear are 37/21, it will likely be more fast than the original gear ratio environment. For the original setting, pinion gear ratio are 16, 18 and 20T, usage with 35T spur gear, pinion gear ratio are modification 18, 20 and 22T, for use with 33T spur gear, pinion gear ratio are 20, 22 and 24T. Fast gear set offer a higher rate for the m-chassis.