Yukon Jeep JK Dana 44 Grizzly Locker - Non-Rubicon, 30-Spline
YGLD44-3-30-JK
The Yukon Grizzly Locker for Jeep JK Dana 44 Rear Axles is a heavy-duty automatic locking differential built for 2007–2017 Jeep Wrangler JK Non-Rubicon models with 30-spline rear axle shafts. When you're running larger tires, climbing ledges, or working through loose terrain, the factory open differential can leave one tire spinning while the other has traction. The Grizzly mechanically locks both rear axle shafts together under power, helping keep your Jeep moving through rocks, mud, steep climbs, and technical trails without requiring an air compressor or driver-operated switch.
Built with heat-treated 8620 steel internal components and Yukon's patented mechanical locking design, the Grizzly uses large engagement teeth to handle drivetrain shock loads from oversized tires and aggressive off-road use. Unlike a full spool that permanently locks both wheels together, the Grizzly can allow differential action during turns when operating conditions permit. Designed specifically for the JK Non-Rubicon Dana 44 rear axle with 30-spline shafts and 1/2" ring gear bolts, it's a straightforward traction upgrade for trail Jeeps and dedicated off-road builds.
Includes:
- (1) Yukon Jeep JK Dana 44 Rear Grizzly Locker - 30-Spline
- Fully Assembled Internal Locking Mechanism
- Locking Differential Carrier Assembly
Important: Designed for compatible Jeep JK Non-Rubicon Dana 44 rear axles with 30-spline shafts and 1/2" ring gear bolts. 2012 and newer JK models equipped with electronic stability control may require additional tuning or system recalibration to address fault codes or limp-mode conditions. Verify compatibility before ordering.
Specifications
| Manufacturer | Yukon Gear & Axle |
|---|---|
| Part Number | YGLD44-3-30-JK |
| Product Type | Automatic Mechanical Locking Differential |
| Axle Platform | Jeep JK Dana 44 |
| Ring Gear Diameter | 8.50" |
| Axle Spline Count | 30-Spline |
| Vehicle Platform | Jeep Wrangler JK Non-Rubicon |
| Model Years | 2007–2017 |
| 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 |
| Ring Gear Bolt Size | 1/2" |
| Differential Cover Bolt Count | 10 |
| Carrier Replacement | Yes - Complete Locking Differential Carrier |
| Axle Position | Rear |
| Air Compressor Required | No |
| Electrical Controls Required | No |
| Assembly | Assembled in the USA |
| Installation Type | Full Differential Carrier Replacement & Gear Setup |
| Primary Application | Jeep JK Rear Axle Traction Upgrade, Trail Riding & Rock Crawling |
| Quantity | Sold Individually |
Fitment
Designed for 2007–2017 Jeep Wrangler JK Non-Rubicon models equipped with the factory Dana 44 rear axle, 30-spline axle shafts, and compatible 1/2" ring gear bolts. Verify the installed axle before ordering, especially on modified or axle-swapped Jeeps.
| Make | Model | Year Range | Axle Application |
|---|---|---|---|
| Jeep | Wrangler JK Non-Rubicon | 2007–2017 | Dana 44 Rear / 30-Spline |
| Jeep | Wrangler Unlimited JK Non-Rubicon | 2007–2017 | Dana 44 Rear / 30-Spline |
Fitment Notes:
- Fits compatible Jeep Wrangler JK Non-Rubicon Dana 44 rear axle applications
- Requires 30-spline axle shafts
- Designed for 1/2" ring gear bolt applications
- Rear axle applications only
- Not intended for factory Dana 30 front axles
- Not intended for JK Rubicon rear axles without confirmed compatibility
- Verify axle identification, spline count, carrier compatibility, and ring gear bolt size before ordering
- Professional differential installation and gear setup are recommended
Electronic Stability Control Warning: Some 2012 and newer Jeep JK models equipped with electronic stability control may experience fault codes, warning lights, or limp-mode conditions after installing an automatic mechanical locker. Additional tuning or system recalibration may be required. Confirm compatibility with your vehicle's electronic control systems before installation.
FAQ
What does the Yukon Grizzly Locker do in a Jeep JK rear axle?
The Grizzly Locker automatically locks both rear axle shafts together under power, helping deliver traction to both wheels when one tire loses grip. It's a major upgrade over an open differential for rock crawling, steep climbs, mud, and technical trails.
Will this locker fit my Jeep Wrangler JK Non-Rubicon?
It is designed for compatible 2007–2017 Jeep Wrangler JK Non-Rubicon models equipped with a Dana 44 rear axle, 30-spline axle shafts, and 1/2" ring gear bolts. Verify your axle configuration before ordering, especially if the vehicle has been modified.
Will this Grizzly Locker fit a Jeep JK Rubicon?
This model is designed for Non-Rubicon Dana 44 rear axle applications. Factory JK Rubicon rear axles use different differential and locker configurations, so this part should not be treated as a direct replacement without verifying compatibility.
Will installing this locker affect my Jeep's electronic stability control?
It can. Some 2012 and newer JK models equipped with electronic stability control may experience fault codes, warning lights, or limp-mode conditions after installing an automatic locker. Additional tuning or recalibration may be required. Verify compatibility with the vehicle's control systems before ordering.
How is a Grizzly Locker different from a full spool?
A full spool permanently locks both axle shafts together, forcing both wheels to rotate at the same speed. The Grizzly Locker automatically locks under load but can allow differential action during turns when operating conditions permit. This makes it more manageable than a permanently locked spool for mixed trail driving.
Does the Grizzly Locker require an air compressor or wiring?
No. The Grizzly is a fully mechanical automatic locker. It does not require compressed air, electrical wiring, switches, or driver-operated engagement controls.
Can I drive my Jeep on the street with a Grizzly Locker?
Automatic lockers can be used in some street-driven applications, but drivers should expect different handling characteristics compared with an open differential. Engagement and disengagement may be noticeable during turns, parking maneuvers, and throttle changes. Electronic stability control compatibility should also be considered on JK models.
Does installing this locker require differential setup?
Yes. Replacing the differential carrier requires proper carrier bearing preload, ring gear backlash, and gear contact pattern verification. Incorrect setup can cause gear noise, premature wear, or failure. Professional installation is recommended.
Does this locker include bearings or installation hardware?
Carrier bearings, ring and pinion gears, and differential installation components are not listed as included. We recommend inspecting the existing differential components and using the appropriate installation parts during assembly.