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Yukon Gear Minor Install Kit for Ford 8.8in Differential
Keep your Ford 8.8in rear differential running at peak performance with the Yukon Gear MK F8.8 Minor Install Kit. Designed for the widely used Ford 8.8in axle, the YUKMK F8.8 delivers professional-grade components for a dependable, leak-free differential setup. Whether refreshing a worn carrier or completing a ring and pinion swap, MK F8.8 provides the seals, crush sleeve, shims, and marking compound needed to do the job right.
Features and Benefits
- Engineered specifically for the Ford 8.8in differential used across Ford, Lincoln, Mercury, and Mazda platforms
- Includes a new pinion seal to eliminate oil leaks at the pinion flange
- Crush sleeve maintains proper pinion preload during reassembly
- Marking compound and brush allow precise gear mesh pattern verification
- Supershim kit provides adjustable shim selection for backlash and preload setup
- All components manufactured to Yukon Gear's strict quality tolerances
- Backed by Yukon Gear's industry-leading limited warranty
Vehicle Fitment
| Year Range | Make | Model | Notes |
|---|---|---|---|
| 1978-2014 | Ford | F-150 | Ford 8.8in rear differential |
| 1979-2014 | Ford | Mustang | Ford 8.8in rear differential |
| 1978-1996 | Ford | Bronco | Ford 8.8in rear differential |
| 1983-2001 | Ford | Explorer | Ford 8.8in rear differential |
| 1983-2011 | Ford | Ranger | Ford 8.8in rear differential |
| 1975-2014 | Ford | E-Series Van | Ford 8.8in rear differential |
| 1997-2002 | Ford | Expedition | Ford 8.8in rear differential |
| 1995-2014 | Lincoln | Navigator | Ford 8.8in rear differential |
| 1985-2011 | Mercury | Various | Ford 8.8in rear differential |
| 1994-2010 | Mazda | B-Series | Ford 8.8in rear differential |
Specifications
| Specification | Detail |
|---|---|
| Part Number | MK F8.8 |
| UPC | 883584120353 |
| Differential | Ford 8.8in |
| Kit Type | Minor Install Kit |
| Warranty | Yukon Gear Limited Warranty |
What's Included
- Pinion seal
- Crush sleeve
- Supershim kit (assorted shims)
- Marking compound
- Marking brush
Frequently Asked Questions
What differential does the MK F8.8 fit?
The YUKMK F8.8 is designed for the Ford 8.8in rear differential, one of the most common rear axles used in Ford trucks, SUVs, and Mustangs from the late 1970s through the 2010s.
Does the MK F8.8 include bearings?
No. As a minor install kit, YUKMK F8.8 provides seals, sleeve, shims, and marking compound. For a full rebuild with new bearings, a complete master install kit is recommended.
Can I use this kit when replacing my ring and pinion?
Yes. The MK F8.8 is ideal for a ring and pinion swap on a Ford 8.8in differential, providing the consumable components needed to complete the install correctly.
Will this void my vehicle warranty?
Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your vehicle warranty simply because you used an aftermarket part, unless they can prove the part caused the failure. Proper installation of the YUKMK F8.8 should not void your powertrain warranty.
What is the Supershim kit used for?
The Supershim kit provides multiple shim thicknesses to precisely set pinion depth during assembly, ensuring correct gear mesh and long-term durability.
How do I verify the gear mesh pattern?
Apply the included marking compound to the ring gear teeth, rotate the assembly, and inspect the contact pattern. The pattern reveals whether pinion depth and backlash are correctly set.
Is the pinion seal in the kit directional?
Yes. The pinion seal must be installed with the sealing lip facing inward toward the differential fluid. Follow Yukon Gear's installation instructions for proper orientation.
What fluid should I use after rebuilding with MK F8.8?
Use the fluid specified by Ford for the 8.8in differential, typically a 75W-90 or 80W-90 gear oil meeting the required friction modifier specifications for limited-slip applications.
Installation Instructions
- Safely lift and support the vehicle, then drain the differential fluid completely
- Remove the driveshaft and mark its orientation for reinstallation
- Remove the pinion nut, flange, and old pinion seal from the differential housing
- Press out the old crush sleeve and clean all mating surfaces thoroughly
- Inspect bearing races and carrier bearings for wear or damage before reassembly
- Install the new crush sleeve from the YUKMK F8.8 kit onto the pinion shaft
- Press in the new pinion seal with the sealing lip facing inward toward the housing
- Reinstall the pinion flange and tighten the pinion nut incrementally, checking preload frequently with an inch-pound torque wrench
- Apply marking compound to ring gear teeth and check the contact pattern, adjusting shims from the included Supershim kit as needed
- Once the pattern is confirmed, reinstall the differential cover with a new gasket or RTV sealant and fill with the appropriate differential fluid
Proposition 65 Warning: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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