Yukon Gear Master Overhaul Kit 09+ Ford 8.8inch Reverse Rotation IFS Front Diff

Complete Rebuild Kit: Yukon YK F8.8-REV-B for 2009-and-Up Ford 8.8in Reverse Rotation IFS Front Differential

The YK F8.8-REV-B is Yukon Gear and Axle's master overhaul kit engineered for the 2009-and-newer Ford 8.8-inch reverse-rotation independent front suspension (IFS) differential. This application-specific YK F8.8-REV-B complete rebuild kit uses Timken bearings and races and includes all seals, shims, hardware, and installation aids required to fully rebuild the front differential found on F-150, Expedition, and Lincoln Navigator vehicles equipped with the 31-spline front axle. Yukon offers more application-specific kits than any other manufacturer, and the YK F8.8-REV-B is tailor-made to ensure every component fits correctly.

Features and Benefits

• Designed specifically for the 2009-and-newer Ford 8.8in reverse-rotation IFS front differential
• Timken carrier and pinion bearings with matching races for maximum load capacity
• Fits 31-spline front axles
• Complete shim set for precise pinion depth and carrier preload adjustment
• Pinion seal prevents front differential fluid leaks
• Pinion nut, crush sleeve, ring gear bolts, thread locker, and gear marking compound included
• Backed by a 1-year limited manufacturer warranty
• Compatible with Ford F-150 4WD, Expedition, and Lincoln Navigator IFS front differentials

Vehicle Fitment

Specifications

What Is Included

• Timken carrier bearings and races (pair)
• Timken pinion bearings and races (front and rear)
• Pinion seal
• Axle seals
• Complete shim kit (carrier and pinion depth shims)
• Ring gear bolts
• Pinion nut
• Crush sleeve
• Thread locker
• Gear marking compound with brush

Frequently Asked Questions

What is the difference between the standard Ford 8.8in and the reverse-rotation version?
The reverse-rotation 8.8in IFS front differential uses a ring and pinion with reversed spiral angle to allow the front axle to rotate in the correct direction. The standard and reverse-rotation units are not interchangeable. The YK F8.8-REV-B is specifically designed for the reverse-rotation front IFS application.

Does the YK F8.8-REV-B comply with the Magnuson-Moss Warranty Act?
Yes. Yukon Gear and Axle's 1-year limited warranty is offered in compliance with the Magnuson-Moss Warranty Act. Installing the YK F8.8-REV-B does not void your vehicle factory warranty when properly installed and used as directed.

What break-in procedure should I follow after rebuilding with this kit?
For the first 500 miles, avoid sustained high-speed driving and heavy 4WD use. Change the differential fluid at the 500-mile mark to flush out initial break-in debris from the new bearings and gears.

What tools do I need to install the YK F8.8-REV-B?
A bearing press, pinion depth gauge, dial indicator, torque wrench, bearing puller, seal driver set, and micrometer are all required. The gear marking compound included in the YK F8.8-REV-B is essential for verifying gear contact pattern.

Does this kit fit the Ford Expedition and Lincoln Navigator front differential?
Yes. The YK F8.8-REV-B fits 2009-2018 Ford Expedition and 2009-2018 Lincoln Navigator models equipped with the 8.8-inch reverse-rotation IFS front differential.

Can this kit be used for a bearing and seal refresh without replacing gears?
Yes. If your ring and pinion gears are serviceable, you can use this kit to replace all bearings, seals, and hardware without installing new gears.

What axle spline count does this kit support?
The YK F8.8-REV-B fits 31-spline front axles as found in the 2009-and-newer Ford 8.8-inch IFS front differential applications.

What gear oil should I use after the rebuild?
Ford specifies 75W-140 full synthetic gear oil for the 8.8-inch front differential. Always verify the correct specification using the axle tag or owner's manual for your specific application.

Installation Instructions

1. Drain front differential fluid and remove the differential cover. Clean all gasket surfaces.
2. Mark carrier bearing cap positions. Remove carrier assembly from housing.
3. Press off old carrier bearings using a bearing puller. Install new Timken carrier bearings with a press.
4. Remove pinion yoke, nut, and old crush sleeve. Drive out pinion shaft and remove pinion bearings.
5. Press new Timken pinion bearing races into housing. Press new pinion bearings onto the pinion shaft.
6. Set correct pinion depth shim stack using a depth gauge. Install pinion assembly with new shims.
7. Install new crush sleeve. Install pinion yoke and torque pinion nut to specified rolling preload.
8. Set carrier shims for correct backlash and side bearing preload. Install marked caps to spec.
9. Apply thread locker to ring gear bolts. Torque in a cross pattern to specification.
10. Verify gear contact pattern with marking compound. Adjust shims if needed.
11. Install new pinion seal and axle seals. Install differential cover with fresh sealer.
12. Fill with correct gear oil to specification and verify for leaks.

Prop 65 Warning: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.