Yukon Gear Dura Grip Positraction For Ford 8.8in w/28 Spline Axles

Yukon Gear DuraGrip Limited Slip Differential for Ford 8.8 Inch with 28 Spline Axles

From Fox Body Mustangs to F-150s and Expeditions, the Ford 8.8 inch rear differential is one of the most common and capable rear axles in performance and sport truck applications. The YDGF8.8-28-1 Yukon Gear DuraGrip delivers clutch-style limited slip performance for 8.8 inch Ford axles with 28-spline axle shafts, providing smooth two-wheel drive traction without the aggressive engagement of a mechanical locker. Part number YDGF8.8-28-1 fits all gear ratios available on the Ford 8.8 platform, making it a universal upgrade for street, strip, and towing applications. The YDGF8.8-28-1 uses a composite clutch pack system inside a forged 4320 chromoly spider gear carrier for durability that outlasts factory Trac-Lok units.

Features and Benefits

• Fits Ford 8.8 inch rear differential with 28-spline axle shafts
• Compatible with all gear ratios on the Ford 8.8 platform
• 4-spring, clutch-style positraction for smooth progressive torque transfer
• Composite clutch packs for reduced chatter and extended clutch life
• Forged 4320 chromoly steel spider gears for superior strength
• Nodular iron carrier case for high load resistance
• Fully rebuildable with available clutch pack rebuild kits
• Assembled in the United States
• Replaces worn factory Trac-Lok limited slip or open differential
• One-year warranty against manufacturer defects

Vehicle Fitment

Specifications

What Is Included

• One fully assembled DuraGrip positraction carrier
• Pre-installed composite clutch packs and 4-spring preload assembly
• Forged 4320 chromoly spider gears installed

Frequently Asked Questions

Will YDGF8.8-28-1 fit my Fox Body or SN95 Mustang?
The YDGF8.8-28-1 fits 1979 through approximately 2004 Ford Mustang with the 8.8 inch rear axle and 28-spline axle shafts. It will not fit the 1999 through 2004 SVT Cobra which has an independent rear suspension.

What is the difference between 28-spline and 31-spline Ford 8.8?
28-spline axles are found in lighter-duty applications like Mustang and Ranger. 31-spline axles are found in heavier trucks and SUVs like F-150, Expedition, and Explorer. For 31-spline applications, use YDGF8.8-31-1.

Does YDGF8.8-28-1 replace the Trac-Lok?
Yes. The YDGF8.8-28-1 is a direct replacement for the factory Ford Trac-Lok limited slip unit and open differential carriers in Ford 8.8 inch axles with 28-spline shafts.

What gear oil is required after installation?
Use a high-grade non-synthetic GL-5 75W-90 gear oil. For normal street use, 75W-90 matches the factory fill weight. Yukon Gear also recommends adding Yukon LSD additive (OILADD) to prevent clutch chatter.

Can I install this myself?
Installation requires differential carrier removal, which involves setting backlash and bearing preload. This job is suitable for an experienced home mechanic with dial indicator tools, but professional installation is recommended for best results.

Is YDGF8.8-28-1 street legal and emissions compliant?
Yes. The YDGF8.8-28-1 is an internal drivetrain component with no effect on vehicle emissions. It is legal for street use in all 50 states.

Does the Magnuson-Moss Warranty Act protect me after this installation?
Under the Magnuson-Moss Warranty Act, aftermarket component installation such as YDGF8.8-28-1 cannot be used by a dealer to blanket-void your vehicle warranty. Specific failure causation must be proven.

What if my Ford 8.8 has a Traction-Lok service kit installed?
If a factory clutch pack rebuild kit was recently installed in your existing carrier, it may extend its service life. However, the YDGF8.8-28-1 is a new complete carrier and represents a more comprehensive upgrade than a rebuild kit for the old carrier.

Installation Instructions

1. Drain the differential and remove the cover, driveshaft, and axle shafts.
2. Mark and remove bearing caps. Extract the existing carrier and set aside shims by side.
3. Transfer the ring gear to the new YDGF8.8-28-1 carrier. Torque ring gear bolts to approximately 70 to 80 ft-lb.
4. Press new side bearings onto the carrier if required.
5. Reinstall carrier with original shims. Check backlash with a dial indicator (target 0.008 to 0.015 inch for Ford 8.8).
6. Verify carrier bearing preload and gear tooth contact pattern.
7. Install bearing caps to their original sides and torque to specification.
8. Clean cover mating surface. Install cover with RTV. Fill with GL-5 gear oil and LSD additive.
9. Reinstall axle shafts and driveshaft. Verify all torques.
10. Road test for noise and recheck fluid level after 100 miles.

Proposition 65 Warning: This product can expose you to chemicals including lead and lead compounds, which are 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.