Yukon Gear Master Overhaul Kit for GM 8.6in Rear Differential 1999-2008

Yukon YK GM8.6-A GM 8.6in Rear Differential Complete Rebuild Kit for 1999 to 2008

The YK GM8.6-A from Yukon Gear and Axle is the comprehensive master overhaul kit for the GM 8.6-inch rear differential used in 1999 through 2008 GM full-size trucks, SUVs, and vans including Chevrolet Silverado, Tahoe, Suburban, S10, Trailblazer, and Express, as well as GMC Sierra, Yukon, Sonoma, and Savana, and Cadillac Escalade. When your 1999-2008 GM 8.6 rear axle develops bearing noise or fluid leaks, the YK GM8.6-A provides every component for a thorough complete rebuild kit. Timken bearings, a full shim set, all seals, and hardware are included.

Features and Benefits

• Engineered for the GM 8.6-inch rear differential in 1999-2008 GM trucks, SUVs, and vans
• Timken carrier bearings and races for proven reliability and extended service life
• Timken pinion bearings and races for accurate pinion depth and quiet operation
• Complete pinion depth shim set for correct gear mesh and contact pattern
• Complete carrier shim set for proper backlash and bearing preload
• Pinion seal and axle seals to eliminate fluid leaks
• Ring gear bolts, pinion nut, and crush sleeve for a complete hardware refresh
• Gear marking compound with brush and thread-locking compound included
• Differential cover gasket included
• Compatible with OEM and aftermarket ring and pinion gear sets
• All components quality-verified to Yukon Gear standards

Vehicle Fitment

Specifications

What Is Included

• Timken front carrier bearing and race
• Timken rear carrier bearing and race
• Timken inner pinion bearing and race
• Timken outer pinion bearing and race
• Pinion seal
• Axle seals (pair)
• Complete pinion depth shim set
• Complete carrier shim set
• Ring gear bolt set
• Pinion nut
• Crush sleeve
• Thread-locking compound
• Gear marking compound with brush
• Differential cover gasket

Frequently Asked Questions

What years does the YK GM8.6-A cover?
The YK GM8.6-A is designed for 1999 through 2008 GM 8.6-inch rear differentials. For 2009 and newer applications, use the YK GM8.6-B, which accommodates updated bearing specifications.

Does the YK GM8.6-A include Timken bearings?
Yes. The YK GM8.6-A includes Timken carrier bearings with races and Timken pinion bearings with races for industry-leading precision and durability.

Can I use this kit with aftermarket ring and pinion gears?
Yes. The shim set in the YK GM8.6-A enables proper setup for both OEM and aftermarket gear ratios.

Is a differential cover gasket included?
Yes. A differential cover gasket is included in the YK GM8.6-A for a complete rebuild.

Does this kit fit Chevrolet Trailblazer models?
Yes. The YK GM8.6-A covers 2002-2008 Chevrolet Trailblazer and 2002-2009 GMC Envoy models equipped with the GM 8.6-inch rear axle. Confirm your specific axle before ordering.

Will installing the YK GM8.6-A void my vehicle warranty under the Magnuson-Moss Warranty Act?
Under the Magnuson-Moss Warranty Act, a vehicle manufacturer cannot void your warranty solely because an aftermarket part was installed. The warranty is voided only if the manufacturer proves the part caused the specific failure. Consult your warranty documents and a qualified professional.

What warranty does Yukon Gear provide on the YK GM8.6-A?
Yukon Gear and Axle offers a limited warranty for defects in materials and workmanship. Contact Yukon Gear for full terms.

Is professional installation recommended?
Yes. Correct pinion depth, backlash, and bearing preload settings are critical. A qualified drivetrain technician is strongly recommended.

Installation Instructions

1. Raise and support the vehicle on jack stands. Drain differential fluid.
2. Remove the rear driveshaft from the differential flange.
3. Remove the differential cover and clean all mating surfaces.
4. Mark bearing caps for correct reinstallation orientation.
5. Remove carrier bearing caps and extract the carrier assembly.
6. Press old carrier bearings off and discard with races.
7. Remove the pinion nut and flange, then drive out the pinion shaft.
8. Press out old pinion bearings and remove the pinion seal.
9. Clean all bearing bores and housing surfaces.
10. Press new Timken pinion bearing races into the housing using appropriate drivers.
11. Determine correct pinion shim and install new inner pinion bearing and shim on the pinion shaft.
12. Install new crush sleeve and outer pinion bearing. Install new pinion seal. Thread on pinion nut and torque to specification while monitoring rotating torque.
13. Press new Timken carrier bearings onto the carrier. Install carrier with correct shims to achieve specified backlash.
14. Verify gear contact pattern with marking compound. Adjust shims as needed.
15. Torque bearing caps to spec. Install new gasket and cover, fill with correct gear oil, reinstall driveshaft, and lower the vehicle.

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.