The XB2 ball differential is preferred for all XB2 configurations whenever applied to very-low to medium-traction dust or clay areas to enhance traction. The externally-adjustable ball differential is machined from HUDY Spring metal™ and is in addition hardened for additional durability and long lifespan. A high-quality carbide thrustbearing and carbide balls are included for ultra-smooth procedure. The ball differential comes factory pre-assembled.