Prepare your semi truck to be Ready for the Road Ahead , with the Fuller- Transmissions 13-Speed Shift Knob that provides an efficient change of gear speeds. Thanks to its ergonomic design, this replacement knob gives operators full control over a vehicle's gear speeds, allowing them to move up or down as needed. Crafted with top-quality materials to withstand constant use and pressure from regular shifting. FleetPride is your First Click in Heavy Duty .