Front/Rear Active Differential set for XB4. The initial XRAY Active Differential is an excellent, adjustable front part part side gear differential for XB4 ... dramatically enhancing the buggy's speed and handling traits. The first design about the interior elements utilizing various angled parts enables the diff gears to trigger on-power to boost the forward traction, causeing the faster and easier to drive. Due to the fact XRAY Active Differential is a performance selection for serious racers who wants to gain an advantage on superior speed and control, it is also of good benefit to motorists of amounts looking a more predictable and easy-to-drive vehicle in virtually every competition conditions. Ball-bearings perhaps not included Fits XB4'20-21
