Redesigned XB2 ball differential offers improved performance. Recommended for all XB2 designs whenever placed on very-low to medium traction dust or clay areas to improve traction. The externally-adjustable ball differential is machined from HUDY Spring metal™ which is often additionally hardened for additional durability and long lifespan. A high-quality carbide thrustbearing and carbide balls are included for ultra-smooth procedure. Includes outdrive adapters designed for usage with drive shafts with 2.5mm pin.