- Radius arm
- A long arm from the axle back to a frame bracket that locates a coil-sprung front axle.
- Track bar
- A bar that keeps the axle centered side to side.
- Caster
- The steering axis tilt that helps the truck track straight.
- Drop bracket
- A bracket that lowers a radius arm frame mount to restore its angle after a lift.
- Leveling kit
- A small front lift that brings the front up to the rear's height.
- Dana 60 / Dana 50
- Solid front axle types used under Super Duty 4x4s and the Excursion.
- Steering damper
- A shock absorber on the steering linkage; Ford calls it a steering linkage damper.
- Death wobble
- Violent front-end shake on solid-axle trucks, usually triggered by a bump.
- Twin I-Beam
- Ford's 4x2 independent front suspension.
- Tire placard
- The label (usually on the door jamb) with original tire size and pressure.
Where this comes from
- Diesel World: 05+ Super Duty axle swap guide
- Diesel Power Products: Wheel alignment on lifted trucks
- Ford TSB 19-2274 (filed with NHTSA): 2017-2019 Super Duty 4WD steering oscillation (PDF)
- Ford: 2013 F-Series Super Duty technical specifications (PDF)
- eCFR: 49 CFR 571.110, tire selection and rims (placard)
Last reviewed 2026-10-19. General information only: Ford and your kit maker's instructions come first.