Front/Rear Active Differential set for XB4. The initial XRAY Active Differential is an excellent, adjustable front component part side gear differential for XB4 ... significantly improving the buggy's rate and handling traits. The very first design in regards to the interior elements utilizing different angled components allows the diff gears to trigger on-power to boost the forward traction, causeing the quicker and better to drive. Because XRAY Active Differential is a performance selection for serious racers who would like to gain a benefit on superior rate and control, it's also of good benefit to motorists of amounts looking a far more predictable and easy-to-drive automobile in virtually every competition conditions. Ball-bearings not included Fits XB4'20-21
