Yukon GM 14-Bolt Locking Differential - 10.5", 30 Spline
YGLGM14T-30
The GM 14-Bolt Grizzly Locker – 10.5", 30 Spline is a heavy-duty automatic mechanical locking differential designed to deliver maximum traction in the toughest off-road, towing, street, and competition environments. Built by Yukon Gear, the Grizzly Locker transfers 100% of available torque to both axle shafts whenever traction demands it while automatically disengaging during normal cornering for predictable operation.
Manufactured with heat-treated 8620 steel internals and a patented locking mechanism, the Grizzly is engineered to withstand high horsepower, oversized tires, and severe axle loads. Whether you're building a rock crawler, Ultra4 racer, tow rig, or trail truck, this locker provides dependable traction without requiring switches, compressors, or electrical components.
Includes:
- (1) Yukon GM 10.5" 14-Bolt 30-Spline Locking Differential
- Manufacturer Installation Instructions
Specifications
| Specification | Details |
|---|---|
| Manufacturer | Yukon Gear & Axle |
| Product Type | Automatic Mechanical Locker |
| Axle Compatibility | GM 10.5" 14-Bolt Truck Differential |
| Spline Count | 30 Spline |
| Internal Material | 8620 Heat-Treated Steel |
| Carrier Type | Installs into Standard Open Carrier |
| Cover Bolt Count | 14 Bolt |
| Operation | Automatic Mechanical Locking Differential |
| Country of Assembly | USA |
Fitment
| Axle | Spline Count | Carrier |
|---|---|---|
| GM 10.5" 14-Bolt Full-Float | 30 Spline | Standard Open Carrier |
Fitment Notes
- Fits GM 10.5-inch 14-Bolt truck differentials with 30-spline axle shafts.
- Installs into a factory-style open differential case.
- Does not fit limited-slip or full spool carriers.
- Factory thrust washers must be removed during installation. Failure to remove them can cause improper locker operation and component damage.
- Verify axle spline count and carrier configuration before ordering.
- A complete vehicle fitment list is available from the manufacturer. :contentReference[oaicite:0]{index=0}
Tech Insight
1. How does the Grizzly Locker improve traction?
The Grizzly Locker automatically locks both axle shafts together whenever torque is applied, ensuring both rear tires receive power instead of allowing torque to escape through the tire with the least traction. This dramatically improves climbing ability, mud performance, and obstacle control.
2. What is the advantage of a mechanical locker over an open differential?
An open differential sends power to the wheel with the least resistance, often resulting in a spinning tire. A mechanical locker transfers torque to both axle shafts, allowing the vehicle to continue moving even when one tire has little or no traction.
3. Why are 8620 heat-treated steel internals important?
8620 alloy steel provides excellent toughness and fatigue resistance after heat treatment. This allows the locker's internal locking components to withstand repeated shock loads from oversized tires, high-horsepower engines, and aggressive off-road driving.
4. Does the Grizzly Locker require air lines or electrical controls?
No. The Grizzly is a fully mechanical automatic locker that operates without compressors, wiring, switches, or onboard air systems, reducing installation complexity and eliminating additional failure points.
5. What is the most common installation mistake?
The factory thrust washers must be removed before installation. Leaving them in place prevents proper locker operation and can damage internal components. Always follow Yukon installation procedures and verify backlash, carrier bearing preload, and gear pattern during reassembly.