The early Bronco's Dana 44 front axle is a proven unit that has held up under serious use for sixty years. It's not the largest axle available and it won't hold up to the abuse you can give a Dana 60 — but for street-plus-trail builds on 33s and 35s, a well-maintained 44 with the right gearing will not be your weak point.
Specs and Configuration
| Spec | Detail |
|---|---|
| Ring gear diameter | 8.5 inches |
| Axle shaft spline count | 30-spline inner, 19-spline outer (1966–1971); 27-spline inner in later versions |
| Stock ring and pinion | 3.50:1 open differential |
| Knuckle type | Open knuckle (1966–1970); closed/radius arm knuckle style in later variants |
| Axle U-joints | Dana Spicer 1310 series |
| Wheel bearing type | Tapered roller bearing, manually adjustable |
| Transfer case mating | Dana 20 (stock) via front driveshaft |
Common Failure Points
Wheel bearings
The tapered roller front wheel bearings require periodic adjustment and re-packing. Neglected bearings develop play that accelerates wear on the spindle and hub. If you feel any wobble or hear a cyclic groan on turns, check the front bearings first. A full bearing service with new races runs $80–$150 in parts. This is the highest-frequency maintenance item on the 44 front end.
Ball joints
Upper and lower ball joints wear predictably with age. Worn ball joints cause wandering steering and — at the far end — dangerous loss of control. Check them by lifting the front wheels off the ground and grabbing the tire at 12 and 6 o'clock — movement indicates wear. Replacement ball joints run $40–$80 each and are still readily available from Dana aftermarket sources.
Axle U-joints
The outer axle U-joints (sometimes called birfields or Spicer-style universal joints depending on the year) transmit power through the steering knuckle to the front hubs. They fail from aggressive angles and neglected lubrication. A clunk or vibration at full steering lock on low-speed turns is the classic symptom. Replace in pairs. Quality replacements from Spicer run $35–$60 each.
Steering gear play
The recirculating ball steering box develops slop with age and miles. Excessive play at the steering wheel that can't be adjusted out means a rebuild or replacement is due. The stock steering geometry also induces some slop at trail speeds — a drag link and tie rod inspection is warranted on any truck over 150,000 miles.
High-Steer Conversion
High-steer kits relocate the steering tie rod from below the axle tube to above it — eliminating the bumpsteer tendencies that appear when lift height separates the drag link and tie rod angles. If you're running more than 4 inches of lift, a high-steer conversion is worth doing. Companies like Slee Off-Road and early Bronco specialists offer kits specific to the Dana 44 application. Budget $400–$800 for the hardware plus alignment costs.
Axle Shaft Upgrades
Stock axle shafts hold up fine for street and moderate trail use. If you're running 37-inch or larger tires, running a locker, or competing, upgrading to chromoly shafts from Superior Axle & Gear or Alloy USA is worthwhile insurance. Chromoly shafts run $200–$350 per side — not cheap, but far less than a trail repair on broken OEM steel.
Locker Options
The Dana 44's 8.5-inch ring gear supports the full range of locking differentials:
Detroit Locker — fully automatic, engages and disengages mechanically. Excellent traction, noticeable handling characteristics on pavement (some understeer, occasional clunk on tight turns at low speed). The traditional trail-use choice for a front axle you want locked at all times off-road.
ARB Air Locker — air-actuated, fully open until you lock it from the cab. The most trail-capable option because you control exactly when it engages. Requires a compressor, air lines, and cab switch. Installation is more involved but the control is worth it for varied-terrain driving.
Lunch box lockers (Detroit TruTrac, Spartan) — a drop-in automatic locker that replaces the spider gears. Lower cost, minimal installation. Works well for trails but can cause steering pull on street use. A reasonable budget option for weekend-only builds.
Gearing for Tire Size
The stock 3.50:1 ring and pinion is appropriate for the truck's original tire size (30–31 inches). Any significant tire upgrade requires a regear to restore highway RPM and driveability.
| Tire diameter | Recommended ring/pinion | Notes |
|---|---|---|
| 30–31" | 3.50:1 stock | Original spec. Drives as designed. |
| 33" | 4.10:1 or 4.56:1 | 4.10 keeps highway RPM manageable; 4.56 gives better low-end response |
| 35" | 4.56:1 recommended | The most common combination on trail-built first-gens |
| 37" | 4.88:1 or 5.13:1 | 5.13 preferred if you have a locker and plan serious terrain |
| 40"+ | 5.38:1+ | At this point, evaluate whether the 44 is the right axle for the application |
Dana 44 vs. Dana 60
Verdict
Run the stock Dana 44 until you have a specific reason to upgrade — either because you've broken shafts, you're running 40-inch tires consistently, or you're building for competition. The 44 is not the weak link on a trail-capable street build. Save the budget for gearing, a locker, and fresh ball joints instead.
A Dana 60 front swap is a serious undertaking — new mounts, new driveshaft geometry, modified steering, different wheel bolt pattern in most cases. The weight penalty is real (a Dana 60 weighs substantially more, affecting steering feel and front suspension dynamics on an already front-heavy truck). Build the 44 out correctly before assuming a bigger axle is the answer.