Front/Rear Active Differential set for XB4. The unique XRAY Active Differential is a superior, adjustable front side side side gear differential for XB4 ... significantly improving the buggy's speed and managing traits. The initial design regarding the interior elements utilizing various angled parts enables the diff gears to trigger on-power to enhance the forward traction, making this quicker and easier to drive. Simply because XRAY Active Differential is a performance selection for severe racers who would like to gain a benefit on superior speed and control, it is also of good advantage to motorists of amounts searching an infinitely more predictable and easy-to-drive car in almost every competition conditions. Ball-bearings not included Fits XB4'20-21
