Yukon Gear Grizzly Locker For GM & Chrysler 11.5in w/ 30 Spline Axles

Yukon Gear Grizzly Locker for GM and Chrysler 11.5 Inch Differential with 30 Spline Axles

Part number YGLGM11.5-30 delivers a fully automatic, no-slip locking differential designed specifically for the GM 11.5 inch AAM rear differential found in heavy-duty GM trucks and vans as well as Chrysler 11.5 inch applications using 30 spline axles. The YGLGM11.5-30 Grizzly Locker activates instantly under torque and unlocks smoothly on pavement, giving you 100 percent traction when you need it without compromising drivability on the street. Whether you are towing heavy loads, hauling through deep mud, or crawling over rocky trails, YGLGM11.5-30 is engineered for maximum strength and dependability.

Features and Benefits

• Full mechanical locking action engages automatically under torque for guaranteed traction
• Precision-machined from high-strength steel for maximum load capacity in heavy-duty applications
• Compatible with GM 11.5 inch AAM and Chrysler 11.5 inch differentials using 30 spline axles
• Unlocks smoothly when turning on dry pavement for daily drivability
• Direct drop-in replacement requiring no differential case modification
• Works with standard open carrier bore dimensions
• Designed for use in both highway towing and off-road applications
• Backed by Yukon Gear manufacturer warranty

Vehicle Fitment

Specifications

What Is Included

• One Grizzly Locker differential assembly (YGLGM11.5-30)
• All necessary internal hardware for installation
• Installation instructions

Frequently Asked Questions

Does installing YGLGM11.5-30 void my factory vehicle warranty?
Under the Magnuson-Moss Warranty Act, a dealer cannot void your factory warranty simply because you installed an aftermarket part. They must prove the aftermarket part directly caused the failure in question. Consult your dealer for specifics on your coverage.

What vehicles use the GM 11.5 inch differential with 30 spline axles?
This axle housing is found in GM HD trucks (Silverado and Sierra 2500 HD and 3500 HD) built from 2001 and newer as well as Dodge and Ram 2500 and 3500 trucks using the 11.5 inch Chrysler AAM housing. Always verify your axle spline count before ordering YGLGM11.5-30.

Will this locker work with my current gear ratio?
The YGLGM11.5-30 is compatible with 4.10 and numerically higher gear ratios. It will not fit carriers designed for 3.73 and below in the GM 11.5 inch housing.

Does a Grizzly Locker affect highway driving?
Grizzly Lockers disengage on light throttle during turning, which allows normal two-wheel-steering behavior on paved roads. Some light clicking or ratcheting sounds during turns is normal.

What tools are required to install YGLGM11.5-30?
Professional installation is strongly recommended. You will need a bearing press, dial indicator, pattern compound, torque wrench, and differential setup tools specific to the GM 11.5 inch housing. Carrier bearing preload and backlash must be set correctly.

Do I need to replace my axle shafts when installing this locker?
Your existing 30 spline axle shafts are compatible. However, if they show signs of wear, upgrading to 4340 chromoly replacement shafts is recommended for maximum strength.

Is the Grizzly Locker compatible with ABS brakes?
Yes. YGLGM11.5-30 is compatible with vehicles equipped with ABS. The ABS system functions independently from the differential locking mechanism.

What is the warranty on YGLGM11.5-30?
Yukon Gear provides a manufacturer limited warranty covering defects in materials and workmanship. Warranty claims require proof of purchase and must be submitted through an authorized dealer. The warranty does not cover damage caused by improper installation or misuse.

Installation Instructions

1. Safely lift and support the vehicle. Drain the differential fluid completely.
2. Remove the rear axle shafts by unbolting the retainer plates at the axle flange.
3. Remove the differential cover and clean all mating surfaces thoroughly.
4. Remove the pinion shaft lock bolt, pinion shaft, and spider gears from the existing carrier.
5. Unbolt and remove the carrier bearing caps, marking their orientation for reinstallation.
6. Press the ring gear off the old carrier and press or drive carrier bearings off.
7. Transfer the ring gear to the YGLGM11.5-30 Grizzly Locker carrier using proper bearing press tools.
8. Press new carrier bearings onto the Grizzly Locker carrier.
9. Install the Grizzly Locker assembly into the housing and torque bearing caps to specification.
10. Set ring gear backlash to 0.005 to 0.009 inch using shims. Verify with a dial indicator.
11. Check gear contact pattern with marking compound and adjust as needed.
12. Reinstall the differential cover with new RTV sealant or gasket, torquing bolts to spec.
13. Reinstall axle shafts and retainer plates, torquing bolts to factory specification.
14. Fill differential with manufacturer-recommended gear oil to the proper level.
15. Road test the vehicle and inspect for leaks before returning to service.

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.