Lifting a TTB pushes camber positive (the top of the wheel tilts outward) and pulls caster low (the wheel wants to flop, not return to center). Adjustable caster/camber bushings handle up to about 2.5–4° of correction. Anything beyond a 4-inch lift needs pivot drop brackets to keep the geometry honest. Target spec on a lifted truck: 0° camber and +4° to +6° caster.
The Twin Traction Beam axle is a geometry trap. Each beam pivots at the opposite frame rail, so when you lift the truck, the wheel swings on a long arc. That arc rotates the knuckle outward at the top (positive camber) and reduces the angle of the steering axis behind vertical (lowered caster). The truck will track straight if you ignore it, but the tires will scrub the outside shoulders to nothing in 8,000 miles, and the steering will refuse to self-center after a turn — you have to wrestle it back to straight.
The factory caster/camber range on a stock 1980–1996 Bronco is roughly: camber 0° to +1°, caster +2° to +4°. A 2.5-inch lift might push camber to +2° and caster down to +1° — borderline drivable, but the tires will wear funny. A 4-inch lift can push camber to +3° to +4° and caster down to 0° or even negative — undrivable on the highway without correction.
Three correction options, in increasing order of cost and lift height:
**Adjustable caster/camber bushings.** These replace the press-in upper ball joint sleeve with an eccentric (off-center) bushing. Rotating the bushing tilts the knuckle relative to the beam, which changes camber and caster. Common ratings are 1.5°, 2.5°, and 4° of adjustment. James Duff (dufftuff.com) makes 1.5° bushings; multiple vendors offer 2.5°. The 4° versions exist but the eccentric is so off-center that the ball joint life shortens.
**Alignment cams.** Eccentric cams that replace the upper ball joint sleeve fasteners. Same idea, different mounting style. Slightly more manageable to fine-tune than the bushing-style — you turn the cam, lock it down. About 2.5° of total range.
**Pivot drop brackets.** For 4-inch and taller lifts. These move the beam pivot points lower on the frame, which un-rotates the beam arc and brings camber/caster back toward stock geometry without changing the ball joint sleeves. They are the right answer for any lift over 4 inches but require drilling new mounting points in the frame or using new brackets — more involved than a bushing swap.
Target spec on a lifted Bronco: camber as close to 0° as possible (slightly negative is fine), caster +4° to +6°. Toe should be zero or slightly toe-in (1/16" total). Drive the truck for a week before declaring the alignment settled — TTB beams take some miles to relax into their final position after parts swaps.
| Part | Vendor | Est. price |
|---|---|---|
| Adjustable caster/camber bushing — 1.5° (pair) | James Duff | ~$90 |
| Adjustable alignment cams — Dana 44 TTB | Desolate Motorsports / Bronco Graveyard | ~$75 |
| TTB pivot drop brackets — for 4"+ lifts | Skyjacker / Rough Country | ~$180 |
Written and maintained by an AZ wheeler and driveway wrencher. Always cross-reference your factory service manual — modifications affect vehicle safety and warranty. Work at your own risk.