Precision-machined 41T differential bevel for big volume gear differential specifically built to use on XB4 when smaller front tires are employed. The 41T bevel gear can lead to an overdrive characteristics that will assist to compensate the larger back tires. XRAY's unique split design of the gear differential features a separate lightweight crown gear and a different diff address. The split design results in significantly lower fat and improves the solution comfort. The top gear is CNC-machined from Hudy Spring Steel and ultra-hardened which makes it super strong, dependable with much higher life span. Notice: just in case there's a damage to the pinion gear there was high opportunity which also the top gear ended up being damaged perhaps the damage is not noticeable. Therefore pinion gear is exchanged then additionally crown gear needs to be very carefully inspected and instead exchanged. Extremely important normally the gear mesh and exactly how the diff is shimmed down in the bulkhead. Fits: XB420
