Yukon Dana 70U Master Overhaul Kit for Rear Differentials
YUKYK D70-U
The Yukon Master Overhaul Kit for Dana 70U Rear Axles includes the bearings, races, seals, shims, hardware, and setup materials needed to properly rebuild or install gears in a compatible Dana 70U rear differential. Built around quality Timken bearings and races, this complete kit helps restore proper carrier preload, pinion preload, backlash, and dependable operation in heavy-duty trucks, tow rigs, vans, commercial vehicles, and off-road builds.
Dana 70U axles regularly operate under substantial load from towing, payload weight, oversized tires, and high-torque drivetrains. Replacing the critical wear components during a rebuild or gear change gives the installer the parts needed to establish the correct bearing preload and gear pattern instead of reusing components that may already be worn or fatigued.
Includes:
- Carrier Bearings and Races
- Pinion Bearings and Races
- Pinion Seal
- Complete Shim Kit
- Ring Gear Bolts
- Pinion Nut
- Oil Baffles and Slingers
- Thread Locker
- Gear Marking Compound with Brush
- Differential Gasket
Specifications
| Specification | Details |
|---|---|
| Manufacturer | Yukon Gear & Axle |
| Product Type | Master Differential Overhaul Kit |
| Axle Application | Dana Spicer 70U Rear Differential |
| Axle Spline Compatibility | 32-Spline and 35-Spline Applications |
| Bearing Brand | Timken |
| Inner Pinion Bearing Configuration | HM803110 / HM803149 |
| Carrier Bearing Configuration | 382S / 387A |
| Recommended Service | Differential Rebuild or Ring-and-Pinion Installation |
| Axle Position | Rear |
Fitment
| Year | Make | Model |
|---|---|---|
| 1984–1990 | Chevrolet | G30 |
| 1971–1980 | Dodge | B300 |
| 1981–1994 | Dodge | B350 |
| 1984–1993 | Dodge | D250 |
| 1981–1993 | Dodge | D350 |
| 1994–2002 | Dodge | Ram 2500 |
| 1994–2002 | Dodge | Ram 3500 |
| 1999–2003 | Dodge | Ram 2500 Van |
| 1999–2003 | Dodge | Ram 3500 Van |
| 1984–1993 | Dodge | W250 |
| 1984–1993 | Dodge | W350 |
| 1982–1998 | Ford | E-350 Econoline |
| 1999 | Ford | E-350 Econoline Club Wagon |
| 2000–2012 | Ford | E-350 Super Duty |
| 1970–2002 | Ford | F-350 |
| 1999–2002 | Ford | F-350 Super Duty |
| 1984–1990 | GMC | C3500 |
| 1973–1991 | GMC | G35 / G3500 |
| 1984–1990 | GMC | K3500 |
| 1987 | GMC | R3500 |
| 1987 | GMC | V3500 |
Fitment Notes
- Fits Dana 70U rear differential applications only.
- Compatible with listed 32-spline and 35-spline Dana 70U axle configurations.
- Vehicle year, make, and model alone do not guarantee axle fitment.
- Verify the axle identification, carrier bearing numbers, pinion bearing configuration, and spline count before ordering.
- Axles may have been replaced or swapped during the vehicle's service life.
Tech Insight
1. When should I install a master overhaul kit?
A master overhaul kit should be used when rebuilding the differential, replacing a damaged bearing, or installing a new ring-and-pinion set. Replacing the bearings, races, seals, shims, and hardware together gives the installer a consistent foundation for setting up the differential.
2. Why should the old bearings not be reused during a gear change?
Used bearings may have wear patterns, looseness, or surface damage that can affect preload and gear alignment. Reusing worn components can contribute to gear noise, excessive heat, and shortened ring-and-pinion life.
3. Does this kit fit every Dana 70 axle?
No. This kit is specifically listed for Dana 70U rear differential applications using the bearing configurations shown in the specifications. Other Dana 70 variants may use different carrier bearings, pinion bearings, seals, or setup components.
4. Can this kit be used with both 32-spline and 35-spline axles?
Yes, the supplied fitment information lists compatibility with both 32-spline and 35-spline Dana 70U applications. The axle model and bearing configuration should still be verified before ordering.
5. What measurements must be set during installation?
A proper differential setup requires accurate pinion depth, pinion bearing preload, carrier bearing preload, ring gear backlash, and contact pattern. These adjustments require the correct measuring tools and should be completed by an experienced installer.