The fast gear set, the product ratio are: 33/21, 35/21. The original gear are 37/21, it will be more fast in comparison to original gear ratio environment. The initial environment, pinion gear ratio are 16, 18 and 20T, use with 35T spur gear, pinion gear ratio are modification 18, 20 and 22T, to be utilized with 33T spur gear, pinion gear ratio are 20, 22 and 24T. Fast gear set offer a heightened price the m-chassis.