Built specifically for non-Rubicon Jeep JK rear Dana 44 axles, this 30 spline Grizzly Locker is a major upgrade for rigs that need real traction off-road. Whether you're running larger tires, tackling technical trails, or pushing your JK beyond factory limits, this mechanical locker delivers true lockupsending 100% of available torque to both axle shafts under load. Its a proven solution for JK builds that have outgrown factory differentials and need consistent performance in rocks, mud, and loose terrain.

Internally, this unit is engineered to handle shock loads and aggressive trail use. The patented design features larger engagement teeth and improved gear geometry, increasing strength and reducing common failure points. Built with 8620 steel internals and assembled in the USA, this locker is designed for long-term durability while still allowing disengagement during turns for improved drivability.

Includes:

• (1) Mechanical locking differential (30 spline)
• Fully assembled internal gear set
• Installation-ready unit for JK Dana 44 carriers

Specifications

• Fits Jeep JK non-Rubicon Dana 44 rear axle
• 30-spline axle compatibility
• Automatic mechanical locking differential
• 100% torque transfer under load
• 8620 steel internal components
• Patented gear design for increased strength and durability
• Larger internal teeth to resist shock load and breakage
• Assembled in the USA
• Ring Gear Bolt Size: 1/2"
• Differential Cover Bolts: 10

Fitment

• Requires 30-spline axle shafts
• 2012+ models with stability control may require aftermarket ECU tuning to prevent codes or limp mode
• Verify axle configuration and ring gear bolt size before purchase
  

  Make	Model	Year Range	Axle
  Jeep	Wrangler JK Non-Rubicon	20072017	Dana 44 Rear

Tech Insight

The factory JK Dana 44 rear axle is capable, but traction becomes a limiting factor as tire size and terrain difficulty increase. A mechanical locker like the Grizzly ensures both wheels receive equal torque under load, dramatically improving off-road capability.

On 2012+ JKs equipped with stability control systems, installing a mechanical locker can trigger fault codes or limp mode. Proper ECU tuning or system recalibration is often required to ensure normal operation after installation.