This is CNC Spiral Cut Input Pinion Gear for the 4XS. Kit standard in the 4XS'17 Spec kits.
The gear itself and the axle shaft is now in one piece which elimiates the chance of loosing the locking screw from original design.
Precisionly made Spiral Cut Gears ensure the smoothest of the ride and maxmimum performance from the transmission.
This is a MUST Option parts for the serious racers.
You will need the original Bearings and Bearing holder and coupling and CV shaft to complete the modification.
NOTE: YOU CANNOT USE THIS SPIRAL CUT GEAR WITH THE ORIGINAL STRAIGHT GEAR. ONLY WORKS WITH CA15812 CNC DIFF RING GEAR