Yukon GM 14-Bolt Grizzly Locker - 10.5", 40-Spline, 4.10 & Down
YGLGM14T-3-40
The Yukon GM 14-Bolt 40-Spline Grizzly Locker is a heavy-duty automatic locking differential built for GM 10.5" 14-Bolt rear axles upgraded to 40-spline axle shafts. When you're running big tires, serious horsepower, and aggressive terrain, traction and drivetrain strength have to work together. The Grizzly mechanically locks both axle shafts under power, helping keep rock crawlers, rock bouncers, mud trucks, and competition buggies moving when one tire loses grip.
Built with heat-treated 8620 steel internal components, large engagement teeth, and Yukon's patented mechanical locking design, this Grizzly Locker is designed to handle the shock loads found in demanding off-road applications. Unlike a full spool that keeps both wheels permanently locked together, the Grizzly allows differential action during turns when operating conditions permit. Designed for 40-spline GM 14-Bolt axle builds using the 4.10-and-down carrier configuration, it delivers automatic locking traction without air lines, electrical controls, or driver-operated switches.
Includes:
- (1) Yukon GM 10.5" 14-Bolt Grizzly Locker - 40-Spline
- Fully Assembled Internal Locking Mechanism
- Locking Differential Assembly
Important: Requires aftermarket 40-spline axle shafts and a compatible GM 10.5" 14-Bolt differential configuration. This locker is designed for the 4.10-and-down carrier break. Factory thrust washers are not used with this locker. Verify carrier compatibility and follow Yukon's installation instructions before assembly.
Specifications
| Manufacturer | Yukon Gear & Axle |
|---|---|
| Part Number | YGLGM14T-3-40 |
| Product Type | Automatic Mechanical Locking Differential |
| Axle Platform | GM 10.5" 14-Bolt |
| Ring Gear Diameter | 10.50" |
| Axle Spline Count | 40-Spline |
| Carrier Break | 4.10 & Down |
| Standard Gear Compatibility | 4.10 and Numerically Lower Ratios |
| Differential Type | Automatic Locker |
| Locking Style | Mechanical / Automatic Engagement |
| Internal Material | Heat-Treated 8620 Steel |
| Engagement Design | Patented Heavy-Duty Locking Teeth |
| Traction Type | Full Mechanical Lockup Under Load |
| Differential Cover Bolt Count | 14 |
| Carrier Compatibility | GM 14-Bolt 4.10 & Down Configuration |
| Factory Thrust Washers | Not Used |
| Axle Position | Rear |
| Air Compressor Required | No |
| Electrical Controls Required | No |
| Installation Type | Internal Differential Locker Installation |
| Primary Application | 40-Spline GM 14-Bolt Axle Builds, Rock Crawling & Competition Off-Road |
| Quantity | Sold Individually |
Fitment
Designed for compatible GM 10.5" 14-Bolt rear axle assemblies that have been upgraded to 40-spline axle shafts. The vehicle applications below are reference platforms only. Factory axle configurations vary, and this locker is not a direct replacement for a standard 30-spline differential.
| Make | Model | Year Range | Axle Application |
|---|---|---|---|
| Chevrolet | Avalanche 2500 | 2002–2006 | GM 14-Bolt Rear, 40-Spline Conversion Required |
| Chevrolet | C20 Pickup & Suburban | 1973–1986 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | C2500 | 1988–2000 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | C2500 Suburban | 1992–1999 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | C30 Pickup | 1973–1986 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | C3500 | 1988–2000 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | C3500HD | 1991–2002 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | Express 2500 | 1996–2015 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | Express 3500 | 1996–2015 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | Express 4500 | 2009–2015 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | G20 | 1975–1995 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | G30 | 1979–1996 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | K20 Pickup & Suburban | 1973–1986 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | K2500 | 1988–2000 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | K2500 Suburban | 1992–1999 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | K30 Pickup | 1972–1986 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | K3500 | 1988–2000 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | P30 | 1997–1999 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | R20 / R2500 Suburban | 1987–1991 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | R30 | 1987–1988 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | Silverado 2500 | 1999–2004 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | Silverado 2500 HD | 2001–2015 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | Silverado 2500 HD Classic | 2007 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | Silverado 3500 HD | 2007–2013 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | Suburban 2500 | 2000–2013 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | V20 / V2500 Suburban | 1987–1991 | GM 14-Bolt Rear, Verify Axle |
| Chevrolet | V30 | 1987–1988 | GM 14-Bolt Rear, Verify Axle |
| GMC | C25 / C2500 Pickup & Suburban | 1973–1978 | GM 14-Bolt Rear, Verify Axle |
| GMC | C2500 | 1979–2000 | GM 14-Bolt Rear, Verify Axle |
| GMC | C2500 Suburban | 1979–1999 | GM 14-Bolt Rear, Verify Axle |
| GMC | C35 / C3500 Pickup | 1973–1978 | GM 14-Bolt Rear, Verify Axle |
| GMC | C3500 | 1979–2000 | GM 14-Bolt Rear, Verify Axle |
| GMC | C3500HD | 2001–2002 | GM 14-Bolt Rear, Verify Axle |
| GMC | G1500 | 1981–1987 | GM 14-Bolt Rear, Verify Axle |
| GMC | G3500 | 1979–1996 | GM 14-Bolt Rear, Verify Axle |
| GMC | K25 / K2500 Pickup & Suburban | 1967–1986 | GM 14-Bolt Rear, Verify Axle |
| GMC | K2500 | 1979–2000 | GM 14-Bolt Rear, Verify Axle |
| GMC | K2500 Suburban | 1979–1999 | GM 14-Bolt Rear, Verify Axle |
| GMC | K35 | 1977–1978 | GM 14-Bolt Rear, Verify Axle |
| GMC | K3500 | 1979–2000 | GM 14-Bolt Rear, Verify Axle |
| GMC | P3500 | 1997–1999 | GM 14-Bolt Rear, Verify Axle |
| GMC | R2500 / R2500 Suburban | 1987–1991 | GM 14-Bolt Rear, Verify Axle |
| GMC | R3500 | 1987 | GM 14-Bolt Rear, Verify Axle |
| GMC | Savana 2500 | 1996–2015 | GM 14-Bolt Rear, Verify Axle |
| GMC | Savana 3500 | 1996–2015 | GM 14-Bolt Rear, Verify Axle |
| GMC | Savana 4500 | 2009–2015 | GM 14-Bolt Rear, Verify Axle |
| GMC | Sierra 2500 | 1999–2004 | GM 14-Bolt Rear, Verify Axle |
| GMC | Sierra 2500 HD | 2001–2015 | GM 14-Bolt Rear, Verify Axle |
| GMC | Sierra 2500 HD Classic | 2007 | GM 14-Bolt Rear, Verify Axle |
| GMC | V2500 / V2500 Suburban | 1987–1991 | GM 14-Bolt Rear, Verify Axle |
| GMC | V3500 | 1987 | GM 14-Bolt Rear, Verify Axle |
| GMC | Yukon XL | 2015 | GM 14-Bolt Rear, Verify Axle |
| GMC |