Redesigned XB2 ball differential offers enhanced performance. Recommended for all XB2 designs whenever used on very-low to medium traction dirt or clay areas to enhance traction. The externally-adjustable ball differential is machined from HUDY Spring metal and it is furthermore hardened for additional durability and long lifespan. A high-quality carbide thrustbearing and carbide balls are included for ultra-smooth operation. Includes outdrive adapters made for usage with drive shafts with 2.5mm pin.