Yukon Gear Dura Grip For Dana 44 / 30 Spline / 3.73 & Down

Yukon Gear DuraGrip Limited Slip for Dana 44 with 30 Spline Axles and 3.73 and Down Ratios

The Dana Spicer 44 is one of the most capable and widely used differentials in off-road and four-wheel drive applications, found in everything from classic Ford Broncos and Jeep CJ5s to modern Jeep Wrangler JK models. The YDGD44-3-30-1 Yukon Gear DuraGrip delivers premium clutch-style limited slip performance for Dana 44 differentials equipped with 30-spline axle shafts and 3.73 and numerically lower gear ratios. Part number YDGD44-3-30-1 is the narrow-spread carrier version for this axle and is specifically designed for low-ratio applications common on overlanding and daily-driven trail rigs where maintaining both traction and drivability on the street are equally important. The YDGD44-3-30-1 features forged 4320 chromoly spider gears and a composite clutch pack system for durability well beyond factory limited slip units.

Features and Benefits

• Fits Dana Spicer 44 differential with 30-spline axle shafts
• Designed for 3.73 and numerically lower gear ratios (narrow-spread carrier)
• Double-drilled for both 7/16 inch and 1/2 inch ring gear bolts
• 4-spring, clutch-style positraction for smooth traction delivery on the trail and street
• Forged 4320 chromoly spider gears for maximum strength
• Nodular iron carrier case for high-load durability
• Composite clutch packs for reduced chatter and extended service life
• Fully rebuildable with available clutch pack kits
• Assembled in the United States
• Note: requires YSPBLT-027 spacers to use with 3/8 inch ring gear bolts
• One-year manufacturer warranty

Vehicle Fitment

Specifications

What Is Included

• One fully assembled DuraGrip positraction differential carrier
• Composite clutch packs and 4-spring preload assembly pre-installed
• Forged 4320 chromoly spider gears installed

Frequently Asked Questions

What makes YDGD44-3-30-1 specific to 3.73 and lower ratios?
The Dana 44 uses two different carrier spreads. Lower gear ratios (3.73 and numerically lower, such as 3.55, 3.31, and 3.07) use the narrow-spread carrier. The YDGD44-3-30-1 is designed for this narrow-spread configuration. For 3.92 and higher ratios, see YDGD44-4-30-1.

Does YDGD44-3-30-1 fit my Jeep Wrangler JK with 3.73 gears?
Yes. The YDGD44-3-30-1 fits Jeep Wrangler JK (2007 through 2017) rear Dana 44 axles equipped with 30-spline shafts and the stock 3.73 gear ratio. It will not fit the JK with 4.10 or higher gears, which use the wide-spread carrier (see YDGD44-4-30-1).

What ring gear bolt sizes does YDGD44-3-30-1 accept?
The carrier is double-drilled to accept both 7/16 inch and 1/2 inch ring gear bolts. If your application uses 3/8 inch bolts, you must use YSPBLT-027 spacers (sold separately) to fill the larger hole.

Is this the correct unit for the Jeep TJ Rubicon rear Dana 44?
Yes. The Jeep TJ Rubicon (2003 through 2006) rear Dana 44 with 30-spline shafts and 4.10 factory gears would need the YDGD44-4-30-1, not this one. The YDGD44-3-30-1 fits TJ Sport and SE variants with 3.73 rear gears.

What gear oil should I use after installing YDGD44-3-30-1?
Yukon Gear recommends high-grade non-synthetic GL-5 gear oil with Yukon LSD additive (part number OILADD). Synthetic oil is not recommended and may cause clutch noise.

Can I run a front Dana 44 locker and a rear DuraGrip on the same vehicle?
Yes. Many builders prefer a front locker and rear limited slip for controlled four-wheel drive behavior. The rear YDGD44-3-30-1 will provide rear traction bias while leaving front wheel speed differentiation to the locker for controlled line selection on trails.

Does the Magnuson-Moss Warranty Act apply to my Jeep Wrangler?
Under the Magnuson-Moss Warranty Act, installing the YDGD44-3-30-1 cannot serve as a basis to void your vehicle warranty unless a dealer proves this specific part caused the warranty-claimed failure.

Is the YDGD44-3-30-1 rebuildable when clutch packs wear?
Yes. Replacement composite clutch pack kits and spring sets are available. The fully rebuildable design extends the service life of this differential well beyond a single clutch pack service interval.

Installation Instructions

1. Drain differential and remove cover, driveshaft, and axle shafts.
2. Mark bearing caps and remove them. Extract old carrier with shims, keeping shims organized by side.
3. Transfer ring gear to the YDGD44-3-30-1 using correct ring gear bolts for your application (7/16 or 1/2 inch). Torque to approximately 55 to 65 ft-lb for Dana 44.
4. Press side bearings onto the new carrier. Reinstall using original shims as a baseline.
5. Measure backlash with a dial indicator (target 0.005 to 0.010 inch for Dana 44).
6. Verify gear contact pattern with marking compound and adjust shims as needed.
7. Torque bearing caps and reinstall cover with RTV or new gasket.
8. Fill with non-synthetic GL-5 gear oil plus Yukon LSD additive.
9. Reinstall axle shafts and driveshaft. Confirm all torques.
10. Perform break-in driving for 500 miles before hard off-road use.

Proposition 65 Warning: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.