Gear drive set for OD2588 Multi Purpose Aluminum Rear Bulkhead. 27T Counter Gear and 54T differential makes 2.0 secondary reduction ratio. The light weight aluminum spool axle exert powerful traction performance. Also using with floating motor mount. Can set the secondary reduction ratio to 14 patterns within the range of 2.70 to 1.64 using with an optional counter gear set. It is possible to easily adapt to various roads, track and driving styles. All gears are common parts with XEX and can be using Divall and XEX ball differentials.