Front/Rear Active Differential set for XB4. The unique XRAY Active Differential is a superior, adjustable front side side gear differential for XB4 ... greatly improving the buggy's speed and handling faculties. The unique design concerning the interior elements using various angled sections allows the diff gears to trigger on-power to boost the forward traction, rendering it quicker and easier to drive. Due to the fact XRAY Active Differential is a performance selection for serious racers who would like to gain a benefit on superior speed and control, it is also of good advantage to motorists of amounts looking a much more predictable and easy-to-drive vehicle in every race conditions. Ball-bearings not included Fits XB4'20-21
