Yukon Gear Dura Grip For GM & Chrysler 11.5in / 30 Spline

Smooth Aggressive Positraction Traction for the 11.5 Inch GM and Chrysler Rear Axle

The Yukon Gear Dura Grip Limited Slip Differential YDGGM11.5-30-1 is a fully rebuildable positraction unit engineered specifically for GM and Chrysler 11.5 inch rear differentials with 30-spline axle shafts. Unlike a mechanical locker, the YDGGM11.5-30-1 provides smooth yet aggressive traction in a wide range of conditions by using composite clutch packs and 4320 chromoly forged spider gears in a proven 4-pinion design. The result is a limited slip that fits all gear ratios, handles the heavy loads of Duramax and Cummins-powered trucks, and delivers confident traction without the noise or handling characteristics of full mechanical lockers. Whether you are towing heavy, navigating slippery roads, or pushing through moderate off-road terrain in your Silverado, Sierra, Ram or Express HD van, the YDGGM11.5-30-1 gives you the traction performance you need with the street manners you expect from a quality limited slip.

Key Features and Benefits

• 4320 chromoly forged spider gears provide maximum strength and durability under the high torque loads of diesel and heavy duty gas engines
• 4-pinion design distributes load across more contact points for a stronger, longer-lasting differential carrier
• Composite clutch packs deliver smooth yet aggressive positraction engagement across a variety of on-road and mild off-road conditions
• Fits all gear ratios in the GM and Chrysler 11.5 inch AAM rear differential with 30-spline axles
• Fully rebuildable design allows clutch packs to be replaced rather than requiring full differential replacement when service is eventually needed
• Yukon recommends high-grade non-synthetic GL-5 gear oil plus two bottles of Yukon LSD additive for long life and smooth operation
• Nodular iron carrier case resists cracking and distortion under hard use
• Fits a broad range of 2001-2019 Chevrolet, GMC, Dodge and Ram heavy duty truck models
• Backed by Yukon Gear and Axle's product quality standards

Fitment

Specifications

What Is Included

• One Yukon Dura Grip limited slip differential carrier assembly (YDGGM11.5-30-1)
• 4 forged 4320 chromoly spider gears
• Composite clutch pack set
• All internal differential components
• Installation instructions

Frequently Asked Questions

What is the difference between the YDGGM11.5-30-1 Dura Grip and the Yukon Grizzly Locker for the GM 11.5 inch axle?

The YDGGM11.5-30-1 Dura Grip is a clutch-based limited slip differential that provides smooth progressive traction bias between both rear wheels, making it ideal for daily street driving, towing and mild off-road use. The Grizzly Locker is a mechanical positive locker that provides 100 percent lock-up at all times, making it the better choice for extreme off-road, drag racing and rock crawling but noisier on dry pavement. The Dura Grip requires LSD additive and will eventually need clutch pack replacement, while the Grizzly Locker is mechanical with no clutch packs to wear.

Does the YDGGM11.5-30-1 Dura Grip fit all gear ratios in the GM and Chrysler 11.5 inch differential?

Yes. The YDGGM11.5-30-1 is designed to fit all available gear ratios in the GM and Chrysler AAM 11.5 inch rear differential with 30-spline axle shafts. There is no need to select a gear-ratio-specific version of this differential.

What gear oil and additive does Yukon recommend with the YDGGM11.5-30-1 Dura Grip?

Yukon specifically recommends high-grade non-synthetic GL-5 gear oil and two bottles of Yukon LSD additive (part number OILADD) for the YDGGM11.5-30-1. The use of synthetic gear oil is not recommended and may result in aggressive or noisy clutch operation. Always add the friction modifier to ensure smooth engagement and long clutch pack life.

Is the YDGGM11.5-30-1 Dura Grip rebuildable if the clutch packs wear out?

Yes. The YDGGM11.5-30-1 is a fully rebuildable limited slip differential. When the clutch packs eventually wear, you can replace them without replacing the entire carrier assembly, making long-term ownership cost significantly lower than replacing a non-rebuildable unit.

Does the YDGGM11.5-30-1 Dura Grip fit my 2015 Chevrolet Silverado 2500 HD with the AAM 11.5 inch rear axle?

Yes. The YDGGM11.5-30-1 is compatible with 2001-2019 Chevrolet Silverado 2500 HD models equipped with the GM AAM 11.5 inch rear differential and 30-spline axle shafts. Confirm your axle spline count before ordering if any previous axle shaft or differential work has been performed on the truck.

Can I install the YDGGM11.5-30-1 Dura Grip on my 2008 Dodge Ram 3500 Cummins diesel?

Yes. The YDGGM11.5-30-1 fits 2003-2010 Dodge Ram 3500 models with the 11.5 inch AAM rear differential and 30-spline axle shafts. The AAM 11.5 inch axle was used across both GM and Chrysler heavy duty truck platforms, making the Dura Grip a direct-fit solution for Ram diesel applications within the fitment range.

Will I notice any difference in handling or noise after installing the YDGGM11.5-30-1 compared to a factory open differential?

The YDGGM11.5-30-1 Dura Grip provides noticeably better traction on slippery surfaces and during hard acceleration compared to a factory open differential. Unlike a mechanical locker, the Dura Grip does not produce ratcheting or clunking sounds during normal street driving. There may be a slight increase in rear wheel resistance during very tight low-speed turns, which is normal for limited slip differentials.

How often should I service the YDGGM11.5-30-1 Dura Grip limited slip differential?

Yukon recommends following the vehicle manufacturer's differential service intervals for the 11.5 inch AAM axle, typically every 30,000 to 50,000 miles under normal use or more frequently under towing, off-road or high-performance driving conditions. Always use the correct non-synthetic GL-5 gear oil with LSD additive on each service to maintain smooth clutch operation and maximize clutch pack life.

Installation Instructions

1. Drain the rear differential gear oil completely before beginning disassembly.
2. Remove the differential cover and allow all residual oil to drain, then clean all mating surfaces thoroughly.
3. Mark the bearing caps with a paint pen before removal to ensure correct reinstallation on the original sides.
4. Remove the bearing cap bolts and both caps, then carefully lift the factory differential carrier out of the housing.
5. Transfer the ring gear from the factory carrier to the YDGGM11.5-30-1 Dura Grip carrier using new ring gear bolts, torquing them in a cross pattern to the differential manufacturer specification.
6. Install the Dura Grip carrier assembly into the housing, seating the bearing races onto the bearing journals. Reinstall the bearing caps on their original marked sides and torque to the service manual specification.
7. Set ring and pinion backlash and carrier bearing preload per the vehicle service manual. Verify correct pattern contact using gear marking compound before finalizing.
8. Install a new differential cover gasket or apply RTV sealant to the cleaned cover mating surface, then reinstall the cover and torque all bolts to specification.
9. Fill the differential through the fill plug with the correct quantity of high-grade non-synthetic GL-5 gear oil, and add two bottles of Yukon LSD additive (part number OILADD) as specified by Yukon. Do not use synthetic oil.
10. Reinstall the fill plug, lower the vehicle and perform a low-speed break-in drive with several left and right turns to distribute the LSD additive through the clutch packs before returning to normal service.

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.