Yukon Gear High Performance Gear Set For Dana 30 JK Short Reverse Pinion / 4.56

Yukon Gear High Performance Ring and Pinion Gear Set for Dana 30 JK Short Reverse Pinion in a 4.56 Ratio

The YG D30SR-456JK is a high-performance ring and pinion gear set built specifically for the Dana 30 JK short reverse pinion front differential found in the 2007 through 2018 Jeep Wrangler JK. The 4.56 ratio is one of the most popular re-gear choices for JK owners running 33-inch to 35-inch tires, providing an excellent balance of trail torque and fuel economy. YG D30SR-456JK is manufactured from 8620 case-hardened alloy steel with Yukon's REM isotropic superfinishing process, producing a plateau-smooth tooth surface that reduces gear noise, operating temperature, and wear compared to standard-finish ground gears. Each set is sold matched for guaranteed contact pattern and backlash performance.

Features and Benefits

• Engineered for the Dana 30 JK short reverse pinion front differential (2007-2018 Wrangler JK)
• 4.56 gear ratio ideal for 33-inch to 35-inch tire applications
• 8620 case-hardened alloy steel construction for long-term durability
• REM isotropic superfinish for reduced noise, heat, and wear
• Computer-optimized tooth geometry ensures proper full-load contact
• Sold as a matched ring and pinion set
• Must be paired with front and rear re-gear to matching ratio for 4WD compatibility
• Backed by Yukon Gear manufacturer limited warranty

Vehicle Fitment

Specifications

What Is Included

• One ring gear (YG D30SR-456JK)
• One matched pinion gear
• Installation instruction sheet

Frequently Asked Questions

Will installing YG D30SR-456JK affect my factory warranty?
The Magnuson-Moss Warranty Act protects consumers from blanket warranty denials. Your dealer must prove the aftermarket part caused the specific failure before denying a warranty claim.

How is the JK reverse pinion Dana 30 different from the TJ Dana 30?
The JK front Dana 30 uses a reverse-cut pinion that positions the pinion above the ring gear centerline, which provides greater ground clearance for the front differential. YG D30SR-456JK is cut specifically for reverse rotation and cannot be used in TJ or XJ applications.

What is the best tire size to pair with 4.56 gearing in a JK?
A 4.56 ratio is most commonly chosen for JK builds with 33-inch to 35-inch tires. It closely matches the drivetrain feel of a stock JK with factory tires while accommodating the larger wheel and tire combination.

Do I need to re-gear the rear axle at the same time?
Yes. Both front and rear differentials must run the same ratio. The rear Dana 44 on JK Wranglers must be re-geared to 4.56 simultaneously with the front Dana 30 to avoid binding in 4WD.

What is the difference between YG D30SR-456JK and YG D30SR-488JK?
The two gears differ only in ratio: YG D30SR-456JK produces 4.56 gearing while YG D30SR-488JK produces 4.88. The 4.88 ratio is preferred for 37-inch tire builds while 4.56 suits 33-inch to 35-inch tires.

Is professional installation required for YG D30SR-456JK?
Yes. Ring and pinion installation requires specialized tools, experience, and dial indicator setup. Pinion depth, bearing preload, and backlash must all be dialed in precisely to prevent premature failure and gear noise.

What gear oil does the JK Dana 30 require after re-gearing?
Jeep specifies 75W-90 full synthetic gear oil meeting GL-5 specification. Change the fluid after the first 500 miles following installation to flush metal break-in particles from the housing.

What warranty does YG D30SR-456JK carry?
Yukon Gear provides a manufacturer limited warranty against defects in materials and workmanship. The warranty requires professional installation and does not cover damage from improper setup.

Installation Instructions

1. Raise and support the vehicle safely. Drain the front differential oil completely.
2. Remove the front driveshaft and front axle shafts to allow full access.
3. Remove the differential cover and clean the housing mating surface.
4. Mark and remove the carrier bearing caps. Record shim positions.
5. Remove the carrier and old ring gear from the housing.
6. Remove the pinion nut, companion flange, and extract the old pinion. Press off bearing races.
7. Install new pinion bearing races from the master overhaul kit.
8. Set correct pinion depth with shims using a Dana 30 depth gauge.
9. Install new inner pinion bearing on the YG D30SR-456JK pinion. Install with new crush sleeve.
10. Set pinion bearing preload by tightening the pinion nut incrementally until specification is met.
11. Press the YG D30SR-456JK ring gear onto the carrier. Torque ring gear bolts to Dana spec.
12. Install carrier with new carrier bearings. Adjust backlash to 0.005 to 0.009 inch.
13. Verify gear contact pattern and adjust as required.
14. Torque bearing caps. Install cover with new sealant and torque to spec.
15. Reinstall all components, fill with correct gear oil, and road-test. Check for leaks at 50 miles.

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.