Yukon Gear Dana 44 Grizzly Locker Replacement

Yukon Gear Grizzly Locker for Dana 44 with 30 Spline Axles and 3.92 and Up Gear Ratios

The YGLD44-4-30 is the Yukon Gear Grizzly Locker engineered as a direct carrier replacement for Dana Spicer 44 differentials running 30 spline axles and gear ratios of 3.92 and numerically higher. Built for Jeep Wrangler, Cherokee, and a wide range of American trucks and SUVs that use the Dana 44 axle, YGLD44-4-30 transforms the open rear differential into a full mechanical positive-locking unit. The Grizzly Locker locks under power to deliver 100% torque to both drive wheels, then automatically disengages during cornering to allow normal turning behavior. Assembled in the USA and featuring Yukon's patented tooth design and 8620 alloy internals, YGLD44-4-30 is one of the strongest carrier replacement lockers available for the Dana 44 platform.

Features and Benefits

• Fits Dana Spicer 44 differentials with 30 spline axles and 3.92 and up gear ratios
• Direct carrier replacement, full automatic mechanical locker
• Patented internal geometry reduces common locker failure modes
• Inner clutch teeth have a larger radius at the base for up to 350% greater strength versus back-cut designs
• Larger gear teeth resist breakage from shock-loading and broken axle shaft events
• 8620 chromoly alloy steel internals for heavy-duty trail and race use
• Drilled for 7/16-inch ring gear bolts; if existing bolts are 3/8-inch, purchase 10 spacers (part YSPBLT-027)
• Not compatible with early tapered axle designs that used an axle spacer button
• Locks under power and disengages automatically during turns
• Assembled in the USA
• 1-year limited manufacturer warranty with extended lifetime warranty available

Vehicle Fitment

Specifications

What's Included

• One (1) Yukon Grizzly Locker complete carrier assembly (YGLD44-4-30)
• All internal locker components pre-assembled

Frequently Asked Questions

Will YGLD44-4-30 fit my Jeep Wrangler TJ with a Dana 44?
Yes, if your TJ is equipped with the Dana 44 rear axle with 30 spline shafts and a gear ratio of 3.92 or numerically higher, the YGLD44-4-30 is a direct fit. Note that the TJ Rubicon uses 30 spline Dana 44 axles, making this a confirmed match for that application.

What is the difference between a locker and a limited-slip differential?
The YGLD44-4-30 Grizzly Locker is a mechanical automatic locker that physically locks both axle shafts together under power, delivering 100% torque to each wheel. A limited-slip differential uses clutch packs or Torsen gearing to bias torque but still allows some differential speed between wheels. Lockers provide superior traction in rock crawling and extreme off-road; LSDs are gentler in daily driving.

Can I run this locker in a front Dana 44?
Yes, the YGLD44-4-30 is designed to work in both front and rear Dana 44 applications, provided the axle uses 30 spline shafts and a 3.92 or higher gear ratio. Running a locker in the front axle is common on dedicated rock crawlers and trail rigs but may affect on-road steering feel.

Does installing YGLD44-4-30 void my vehicle warranty under the Magnuson-Moss Warranty Act?
Under the Magnuson-Moss Warranty Act, your vehicle manufacturer cannot void your entire warranty because of an aftermarket differential carrier. They must demonstrate that the aftermarket component directly caused any warranty claim. Consult a legal advisor or your dealer for your specific circumstances.

My Dana 44 uses 3/8-inch ring gear bolts. Can I still install YGLD44-4-30?
Yes, but you will need to purchase 10 spacers (Yukon part YSPBLT-027) to adapt the 3/8-inch bolt pattern to the Grizzly Locker's 7/16-inch drilled case. This is a common fitment note for older Dana 44 applications.

Is YGLD44-4-30 compatible with early tapered axle Dana 44 setups?
No. This locker will not work with early tapered axle designs that used an axle spacer button. Verify your axle design before ordering.

What gear ratios are compatible with YGLD44-4-30?
This locker is designed for 3.92 and up gear ratios. For Dana 44 applications with 3.73 and down ratios, Yukon offers the YGLD44-3-30 variant.

Does the Grizzly Locker make noise during turns?
The Grizzly Locker, like all automatic mechanical lockers, may produce a clicking sound during low-speed cornering as it ratchets to allow wheel speed differential. This is normal operation and not indicative of a problem.

Installation Instructions

1. Raise and safely support the vehicle. Drain the differential gear oil from the Dana 44 housing.
2. Remove the differential cover and gasket. Clean the housing flange thoroughly.
3. Mark bearing caps before removal so they are reinstalled in the exact same position and orientation.
4. Remove bearing cap bolts and extract the factory carrier with bearing races and shims. Keep left and right side shim stacks labeled.
5. Remove the ring gear from the factory carrier and inspect gear teeth and ring gear bolts for condition.
6. If existing ring gear bolts are 3/8-inch, install 10 YSPBLT-027 spacers into the ring gear bolt holes of the YGLD44-4-30 carrier.
7. Mount the ring gear onto the YGLD44-4-30 carrier. Apply thread-lock compound and torque ring gear bolts to Dana 44 specification (typically 55 to 70 ft-lb).
8. Press original carrier bearings onto the Grizzly Locker hubs, or install new bearings if replacing.
9. Set the assembly into the housing with original shim packs. Install bearing caps in marked positions.
10. Check and adjust ring gear backlash (typically 0.005 to 0.009 in for Dana 44) and carrier bearing preload.
11. Verify gear contact pattern with marking compound.
12. Torque bearing cap bolts to Dana 44 specification (typically 40 to 55 ft-lb).
13. Install a new cover gasket and cover. Fill with GL-5 gear oil to the proper level.
14. Road test and allow a break-in period of at least 500 miles before severe trail use.

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.