Redesigned XB2 ball differential offers improved performance. Recommended for all XB2 configurations when used on very-low to medium traction dirt or clay surfaces to increase traction. The externally-adjustable ball differential is machined from HUDY Spring Steel™ and is additionally hardened for extra durability and long lifespan. A high-quality carbide thrustbearing and carbide balls are included for ultra-smooth operation. Includes outdrive adapters designed for use with drive shafts with 2.5mm pin.