A "must have in fact" option for XB4 & XB4 2WD, the ball-differential increases traction and it's also suited to low-traction songs.
The complete factory pre-assembled ball-differential features premium HUDY Spring metal diff outdrives and screw for external modification, tough crown gear moulded from supreme quality extra stiff and dependable self-developed graphite composite combination, superior bearings, top-quality carbide axial thrustbearing, heavy-duty diff washers and ceramic 2.4mm diff balls.