Yukon Gear Dura Grip Positraction for 2014+ GM 9.5in & 9.76in w/ 3.42 & Up Gear Ratios

Yukon Gear Dura Grip Positraction for 2014 and Up GM 9.5in and 9.76in with 3.42 and Up Gear Ratios

The YDGGM9.5-4-33-12B is the Yukon Dura Grip limited-slip positraction differential built specifically for 2014 and newer GM 9.5-inch and 9.76-inch 12-bolt rear differentials running 3.42 and numerically higher gear ratios with 33 spline axles. As a clutch-pack style LSD, YDGGM9.5-4-33-12B delivers smooth yet aggressive traction bias across a wide range of terrain without the locked-up handling characteristics of a full locker. Engineered for the modern half-ton truck and SUV platform spanning Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Tahoe, Chevrolet Suburban, GMC Yukon, Cadillac Escalade, and more, this positraction unit is fully rebuildable and backed by Yukon's 1-year limited warranty.

Features and Benefits

• Fits 2014 and up GM 9.5-inch and 9.76-inch rear differentials with 12-bolt cover and 33 spline axles
• Requires gear ratio of 3.42 and numerically higher (3.42, 3.73, 4.10, etc.)
• High-strength nodular iron case for maximum housing rigidity under load
• Forged 4320 chromoly spider gears cut for strongest tooth geometry in any terrain
• Composite clutch packs for long service life and smooth engagement
• 4-spring positraction design provides consistent, predictable traction bias
• Smooth engagement makes it suitable for daily-driven trucks and towing applications
• Fully rebuildable design, rebuild kits available separately
• Compatible with both GM 9.5-inch and GM 9.76-inch housings
• Yukon recommends non-synthetic GL-5 gear oil with Yukon LSD additive (part OILADD)
• Assembled in the USA
• 1-year limited manufacturer warranty

Vehicle Fitment

Specifications

What's Included

• One (1) Yukon Dura Grip positraction differential assembly (YDGGM9.5-4-33-12B)
• Internal spider gears, side gears, and clutch pack assembly pre-installed

Frequently Asked Questions

Does YDGGM9.5-4-33-12B fit my 2018 Chevrolet Silverado 1500?
Yes, this Dura Grip fits 2014 and up Chevrolet Silverado 1500 models equipped with the GM 9.5-inch or 9.76-inch 12-bolt rear differential using 33 spline axles and a gear ratio of 3.42 or higher. Confirm your axle ratio in the door sticker or RPO codes before ordering.

What is the difference between the Dura Grip and the Grizzly Locker?
The YDGGM9.5-4-33-12B Dura Grip is a limited-slip differential that uses clutch packs to bias torque toward the wheel with more traction while still allowing some differential speed between wheels. The Grizzly Locker is a mechanical full locker that locks both wheels together under power. The Dura Grip is smoother for daily driving and towing; the Grizzly Locker delivers maximum traction in extreme off-road scenarios.

Can I use synthetic gear oil with the Dura Grip?
Yukon does not recommend synthetic gear oil for the YDGGM9.5-4-33-12B. Synthetic oil may cause aggressive or noisy clutch engagement. Use a high-grade non-synthetic GL-5 gear oil combined with Yukon LSD additive (part OILADD) for optimal performance and longevity.

Will this fit my 2014 GMC Yukon with the 9.76-inch differential?
Yes, the YDGGM9.5-4-33-12B is compatible with both the GM 9.5-inch and GM 9.76-inch rear differentials used in 2014 and later GMC Yukon, Yukon XL, and similar GM truck-based SUV platforms.

Does installing this positraction affect my Magnuson-Moss Warranty Act coverage?
Under the Magnuson-Moss Warranty Act, a dealer cannot void your vehicle warranty based solely on the installation of an aftermarket positraction unit. They would need to demonstrate that the Dura Grip specifically caused the warranty claim in question. Consult your dealer or legal counsel if you have warranty concerns.

Is the YDGGM9.5-4-33-12B compatible with the GM 9.5 14-bolt used in older trucks?
No. This specific part number is designed for the 2014 and newer 12-bolt GM 9.5-inch and 9.76-inch differentials. For older GM 9.5-inch 14-bolt applications, a different Yukon Dura Grip part number is required.

Is this product rebuildable?
Yes. The Dura Grip is fully rebuildable, and Yukon offers clutch rebuild kits available separately for long-term serviceability.

What gear ratios are required for YDGGM9.5-4-33-12B?
This positraction requires a gear ratio of 3.42 or numerically higher (e.g., 3.42, 3.73, 4.10). If your vehicle has a 3.23 or lower ratio, you will need the lower-ratio Dura Grip part number designed for 3.23 and down.

Installation Instructions

1. Raise and safely support the vehicle on jack stands. Drain the rear differential gear oil completely.
2. Remove the 12-bolt differential cover and gasket. Clean the housing mating surface.
3. Mark the bearing caps for exact reinstallation in original position and orientation.
4. Remove the bearing cap bolts and extract the factory open differential carrier with bearings and shims. Keep the left and right shim stacks separated and labeled.
5. Remove the ring gear from the factory carrier. Inspect all ring gear teeth and ring gear bolts for wear before reuse.
6. Install the ring gear onto the YDGGM9.5-4-33-12B Dura Grip carrier using clean ring gear bolts. Apply thread-lock compound and torque to the specified value for GM 9.5 (typically 85 to 100 ft-lb).
7. Press the original carrier bearings onto the Dura Grip carrier bearing journals, or install new carrier bearings if replacing.
8. Place the Dura Grip assembly into the differential housing with the original shims. Reinstall bearing caps in their marked positions and hand-tighten.
9. Check ring gear backlash (typically 0.005 to 0.009 in) and carrier bearing preload. Adjust shims as needed.
10. Perform a gear contact pattern check using gear marking compound.
11. Torque bearing cap bolts to GM 9.5 specification (typically 55 to 75 ft-lb).
12. Install a new differential cover gasket and cover. Fill with non-synthetic GL-5 gear oil and Yukon LSD additive OILADD to the proper level.
13. Road test to verify normal operation. Allow a 500-mile break-in period before severe towing or off-road use.

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.