MST 210520 Rear shaft ball diff. set (40-13)

The MST RMX Rear Shaft Ball Differential Set is an upgrade for the RMX 2.0 S, as well as the RMX-D kits equipped with the optional 4WD conversion (MXS-210452).  Package includes precision machined outdrives, and the rest of the parts to build one complete ball diff with 40/13T gearing.