Steering Gearbox

A steering gearbox is the core mechanism in traditional recirculating ball steering systems, commonly found in trucks, older vehicles, and heavy-duty SUVs. Unlike modern rack and pinion setups, which are linear, a steering gearbox uses a worm gear, recirculating steel balls, and a sector gear to transfer steering wheel rotation to a swinging pitman arm.

Inside the gearbox, the steering shaft turns a worm gear, causing steel balls to roll along threads and push a nut block forward or backward. This nut block rotates the sector shaft, which turns the pitman arm. The system is highly durable and capable of handling the high suspension loads of heavy vehicles.

Over time, the gears inside the gearbox can wear, leading to steering play, wander, or a loose feeling in the steering wheel. Some gearboxes have an adjustment screw to reduce play, but excessive wear or fluid leaks from the seals will require replacing the entire steering gearbox.