The fast gear set, the item ratio are: 33/21, 35/21. The first gear are 37/21, it will be more fast when compared with original gear ratio environment. The first environment, pinion gear ratio are 16, 18 and 20T, use with 35T spur gear, pinion gear ratio are modification 18, 20 and 22T, become utilized with 33T spur gear, pinion gear ratio are 20, 22 and 24T. Fast gear set offer a heightened cost the m-chassis.