This is an optional XRAY Steel Adjustable Ball Differential Set. This "must have" option is intended for use with the XB4 & XB4 2WD. The differential increases traction and is recommended for low-traction tracks.
The complete factory pre-assembled ball-differential features premium HUDY Spring Steel outdrives and screw for external adjustment, tough crown gear molded from high grade extra stiff and reliable self-developed graphite composite mixture, high-performance bearings, high-quality carbide axial thrust-bearing, heavy-duty diff washers and ceramic 2.4mm diff balls.
This product was added to our catalog on April 1, 2014