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Ford's Twin Traction Beam front axle was its answer to independent front suspension without giving up a beam axle's toughness. Two steel beams, each pivoting near the opposite frame rail, carry the wheels. It is strong, it is simple, and almost every one still on the road has some mix of tire wear, wandering and clunking. The good news is the causes are predictable.
Which TTB Do You Have?
| Axle | Vehicles | Notes |
|---|---|---|
| Dana 28 TTB | 1983-1990 Ranger and Bronco II 4x4 | Lightest of the family |
| Dana 35 TTB | 1991-1997 Ranger and Explorer 4x4 | Not the same as the Jeep Dana 35 rear axle |
| Dana 44 TTB | 1980-1996 F-150 and Bronco 4x4 | The one people swap into Rangers |
| Dana 50 TTB | 1980s-1997 light-duty F-250 4x4 | Heavier gearing and shafts |
Ranger went to an independent front end for 1998, so if your Ranger is newer than that, this page is not your axle.
Problem 1: Tire Wear on the Inside or Outside Edge
The number one TTB complaint. Because each beam pivots on an arc, camber changes as the suspension moves. Sag the springs an inch and the tops of the tires tilt; lift the truck and they tilt the other way. Factory alignment assumes stock ride height. Old coil springs that have settled are enough to start eating tire edges.
Camber is adjusted with offset bushings or sleeves at the upper ball joint. Before buying camber parts, check ride height against spec and replace sagged springs. Aligning around tired springs just moves the problem.
Problem 2: Wandering and Clunk — Pivot and Radius Arm Bushings
Each beam has a pivot bushing at the frame bracket and a radius arm that runs back to a frame bushing. When those rubber bushings tear or go soft, the beams can shift under braking and over bumps. Symptoms:
- Truck darts over road seams and needs constant steering correction
- Clunk from the front when braking or backing out of a driveway
- Camber or toe changes between alignments with no parts replaced
Check with the truck on the ground and a pry bar at the beam pivot and radius arm rear bushing. Visible movement or cracked rubber means replace them. Polyurethane bushings last longer but ride harsher; for a daily driver, quality rubber is fine.
Problem 3: Ball Joints
TTB axles use upper and lower ball joints at each knuckle. Worn joints show up as a clunk over bumps, play when you rock the tire top-to-bottom with the wheel off the ground, and uneven tire wear that does not match the camber pattern. Replace upper and lower as a set on each side; mixing new and old joints wears the new one fast.
Ball joint replacement on these axles requires a press with the right receiver adapters, especially for the lower joint. A cheap universal kit without 4x4 adapters will not seat the joint square, and a joint pressed in crooked will be loose again in a few months.
Problem 4: The Slip Yoke and Passenger-Side Shaft
The passenger-side axle shaft has a slip joint so the beam can move independently of the differential on the driver's side. It is covered by a boot. When the boot tears, water and grit get onto the splines and they wear, rust and bind. Symptoms are a clunk or binding feel in 4WD and a dry, rusty spline when you pull it apart.
Inspect the boot at every oil change. A $20 boot saves a shaft. If the splines are already notched, the shaft has to be replaced.
Problem 5: Axle U-Joints, Hubs and Bearings
The outer axle u-joints wear like any front axle u-joint: clicking in tight turns in 4WD, rust dust at the caps. Wheel bearings and hubs on these trucks are often decades old; grinding that changes with steering input, or a hub that will not engage, points there. See our guides on locking hubs not engaging and manual locking hubs.
Diagnosis Order That Saves Money
- Measure ride height. Replace sagged springs first.
- Check pivot and radius arm bushings with a pry bar.
- Check ball joints with the tire off the ground.
- Check tie rod ends and steering box play.
- Inspect the slip yoke boot and outer u-joints.
- Then get an alignment, with camber adjusted to the new parts.
Doing the alignment first is the most common way people waste money on these trucks.
Typical Repair Costs
| Repair | Parts | Shop Labor |
|---|---|---|
| Ball joints, both sides | $100-250 | 3-5 hours |
| Pivot and radius arm bushings | $60-200 | 3-5 hours |
| Coil springs pair | $100-250 | 2-3 hours |
| Slip yoke boot | $15-40 | 1-2 hours |
| Axle u-joints, both sides | $50-120 | 2-4 hours |
| Alignment with camber | Camber sleeves $30-80 | Alignment charge |
Ranges are for common aftermarket parts and typical independent-shop book times; regional labor rates vary.
Lifted TTB Trucks
Lifting a TTB with longer springs alone pushes camber way out. Proper lift kits drop the beam pivot brackets to restore geometry. If your lifted TTB truck eats tires no matter how many alignments it gets, check whether the pivot brackets were dropped. Many budget lifts skipped that.
Steering Parts That Get Blamed on the Axle
Not every TTB wander complaint is in the beams. The steering linkage on these trucks has several tie rod ends and a drag link, and the steering box mounts to a frame section that can crack on high-mileage trucks. With the engine running and the truck on the ground, have someone rock the steering wheel side to side while you watch each joint. Any visible slop in a tie rod end, or the box moving on the frame before the pitman arm moves, is part of the problem. Fix those before the alignment too.
Shop Tools for the Job
Fix the Front End in the Right Order
Ball joint presses, seal installers and front axle parts ship from our shop. Transmission and transfer case parts for the same truck are at our sister store.
Shop Front Axle Tools → Core Transmission Parts →FAQ
Why does my TTB truck keep eating tires after alignments?
Usually sagged coil springs, worn pivot or radius arm bushings, or a lift without dropped pivot brackets. Camber on a TTB changes with ride height, so alignment cannot hold if the height or bushings are off.
Is the Ranger Dana 35 TTB the same as a Jeep Dana 35?
No. The Ranger and Explorer Dana 35 TTB is a front beam axle. The Jeep Dana 35 is a rear axle. Parts do not interchange.
Can I put a Dana 44 TTB under a Ranger?
It is a common swap and it works, but it requires the full-size beams and brackets and changes track width. Plan for driveshaft, brake and steering changes.
How do I adjust camber on a TTB?
With offset camber sleeves or bushings at the upper ball joint. Set ride height and replace worn bushings first, then align.