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The Dana 50 showed up under Fords in two packages: the Twin Traction Beam (TTB) front on 1980s and 1990s F-250 4x4s, and the straight-axle front on many 1999-2004 Super Duty F-250s and some F-350s, where others got a Dana 60. Both use 30-spline outer stubs, but they fail in different places: TTB trucks eat bushings and tires, Super Duty trucks eat hubs, ball joints and u-joints.
Dana 50 vs Dana 44 vs Dana 60 Identification
Check the axle tag on a cover bolt or the number cast into the housing. On TTB trucks, F-150s and Broncos got the Dana 44 and the F-250 4x4 got the bulkier Dana 50. If yours is the lighter axle, read our Dana 44 guide.
On Super Duty trucks the Dana 50 and Dana 60 look alike and take the same style of cover. If the tag is missing, measure the ring gear: the Dana 60 is roughly 9.75 inches and the Dana 50 is noticeably smaller. If it turns out to be a 60, our Dana 60 front axle guide is the one you want.
TTB Dana 50: Bushings, Beams and Alignment
TTB is two beams pivoting from brackets on opposite frame rails, each located by a radius arm. Camber changes as the beams move, so every worn part shows up on the tires first.
- Pivot bushings. Cracked rubber lets the beam shift and wander.
- Radius arm bushings. Collapsed bushings clunk on braking and let caster change over bumps.
- Coil springs. Sagged springs drop ride height, which on TTB means more negative camber.
- Bent beams. If camber is way out with fresh bushings and correct ride height, suspect the beam.
Camber is set with offset sleeves around the upper ball joint, not a shim pack. Bushings first, ride height second, alignment last.
Ball Joints on Both Versions
Both the TTB and straight-axle Dana 50 use upper and lower ball joints at the knuckle. Jack the wheel, bar under the tire and look for vertical play. On Super Duty trucks worn joints cause violent shake after a bump, and they wear faster with big tires or a plow. Replace uppers and lowers as a set, and on TTB trucks mark the camber sleeve position first.
Hubs, Bearings and Spindle Nuts
The TTB F-250 uses serviceable tapered bearings and manual hubs, held by an adjusting nut and locknut. Dry bearings and overtightened nuts are the usual failures.
The 1999-2004 Super Duty uses sealed unit-bearing hubs with vacuum-actuated hub locks, retained by a large spindle nut. A worn unit bearing growls and changes pitch as you steer side to side. If the hubs will not engage, check vacuum first; our Super Duty vacuum hub lock guide covers that. Do not reuse a chewed spindle nut. The Yukon Dana 50/60 spindle nut kit ($54.89) is cheap insurance.
30-Spline Stub Shafts and U-Joints
The outer stub shafts are 30 spline, and the axle u-joints are the fuse in this front end. Clicking or popping when turning in 4WD usually means a dry or failed joint. Replace both sides together. Our u-joint replacement walkthrough and u-joint symptoms and cost guide cover the job.
The Yukon 4340 chrome-moly outer stub axle for Dana 50/60 ($291.89) is 30 spline and about 9 3/8 inches long; measure yours first.
Ring and Pinion Whine and Spider Gears
With the hubs unlocked in 2WD, the front ring and pinion barely turns, so gear whine mostly shows up in 4WD. Throttle-sensitive whine in 4WD points at pinion bearings; a howl with the hubs unlocked is usually a hub bearing. Rule out driveline vibration with our front driveshaft vibration guide.
The fix for bearing whine is a full overhaul, not more pinion nut torque. The Yukon Dana 50 master overhaul kit for the straight axle ($616.39) covers Super Duty trucks; TTB owners should match bearing numbers against the old bearings before ordering. Worn spider gears clunk on turns. The USA Standard Dana 50 30-spline spider gear set ($198.99) or the Yukon open spider gear kit for 30-spline Dana 50 ($249.92) restores an open carrier. See our backlash and pinion depth setup guide and the master overhaul kit buyer's guide.
If you are adding tires, regear front and rear together to the exact same ratio. Our regear guide helps pick one.
The Swap-to-Dana-60 Debate
On a 1999-2004 Super Duty, a same-era Dana 60 from a diesel or F-350 is close to bolt-in on the leaf springs. For a stock-height work truck, though, a fresh Dana 50 will outlive most owners.
On a TTB F-250, a solid axle swap means spring hangers, new steering and real fabrication. Our take: if the truck is a daily driver on 33s or smaller, rebuild the Dana 50, replace every bushing and align it. If it is going to 35s and up with real off-road use, save the bushing money and put it toward a Dana 60 swap.
What It Costs: DIY vs Shop
| Repair | DIY | Shop (rough) |
|---|---|---|
| TTB pivot and radius arm bushings plus alignment | About $150-$300 | About $600-$1,100 |
| Ball joints, both sides | About $150-$300 | About $500-$900 |
| Axle u-joints, both sides | About $80-$200 | About $400-$750 |
| Super Duty unit bearing hub, one side | About $200-$400 | About $450-$800 |
| Outer stub shaft, one side | About $300-$350 | About $550-$850 |
| Carrier and pinion bearing overhaul | About $620-$750 plus tools | About $1,200-$1,900 |
| Full front-end refresh with overhaul | About $1,200-$1,800 | About $2,500-$4,000 |
DIY assumes you own a dial indicator, inch-pound torque wrench, ball joint press and puller. The Dana 50 holds roughly 2.5 to 3 quarts; fill to the bottom of the fill hole with the gear oil your owner's manual calls for. See the differential fluid change guide for intervals, and if 4WD will not engage at all, check the transfer case with our Super Duty shift motor guide.
Parts and Tools for the Job
| Need | What We Carry |
|---|---|
| Full overhaul (straight axle) | Yukon Dana 50 master overhaul kit ($616.39) |
| Clunk on turns | USA Standard Dana 50 spider gear set ($198.99) or Yukon open spider gear kit ($249.92) |
| Twisted or pitted stub | Yukon 4340 chrome-moly outer stub ($291.89) |
| Spindle nut replacement | Yukon Dana 50/60 spindle nut kit ($54.89) |
| Rock and plow protection | Yukon Hardcore cover for Dana 50/60/70 ($333.89) |
Gear oil is in our fluids section, and CoreTransmissionParts.com carries transmission and transfer case rebuild parts if the noise turns out to be further up the driveline.
Rebuild It Once, Rebuild It Right
A whining Dana 50 only gets louder. Replace the bearings, seals and shims in one pass and get back to work.
Shop the Dana 50 Overhaul Kit → Gear Oil and FluidsFAQ
How do I tell a Dana 50 from a Dana 44 or Dana 60?
Start with the axle tag or the number cast into the housing near the cover. On a Ford TTB truck, the Dana 50 sits under F-250 4x4s while F-150s and Broncos got the TTB Dana 44, and the Dana 50 center section is visibly bulkier. On a 1999-2004 Super Duty, the Dana 50 and Dana 60 look similar from a distance, so read the tag or measure the ring gear: the Dana 60 is roughly 9.75 inches and the Dana 50 is noticeably smaller.
Why does my TTB F-250 eat the inside edges of the front tires?
Twin Traction Beam camber changes as the beams move, so worn pivot bushings, collapsed radius arm bushings, a bent beam or a sagging spring all show up as camber error and inside-edge wear. Replace the bushings, check ride height, then have camber set with the offset ball joint sleeves. Aligning a truck with worn bushings is wasted money.
Is the Dana 50 strong enough for bigger tires?
A healthy Dana 50 handles stock-size and moderately larger tires on a work truck fine. The weak spots are the smaller ring and pinion compared to a Dana 60, the stub shaft u-joints, and on TTB trucks the beams themselves. Past roughly 35-inch tires with hard off-road use, most builders move to a Dana 60.
How much does a Dana 50 front axle rebuild cost?
A DIY master overhaul with bearings and seals runs roughly $620-$750 in parts. A shop overhaul with the existing gears is usually $1,200-$1,900. Ball joints run about $150-$300 DIY or $500-$900 at a shop, and a full front-end refresh with ball joints, u-joints, hubs and a gear overhaul can reach roughly $2,500-$4,000 at a shop.