Yukon Gear & Install Kit Package For Jeep JK Rubicon in a 4.88 Ratio

Yukon Gear and Install Kit Package for Jeep JK Rubicon, Dana 44 Front and Rear, 4.88 Ratio

The YGK015 is a complete re-gear package for 2007 through 2018 Jeep Wrangler JK Rubicon models equipped with Dana 44 front and rear axles. This YGK015 kit bundles matching front and rear 4.88 ratio ring and pinion gear sets with the industry's most comprehensive master overhaul kits, giving you every component required to complete both differentials in a single part number. The YGK015 is the correct choice for Rubicon owners running 35 to 40-inch tires who want to recover the factory crawl ratio and on-road acceleration lost to the larger tire diameter. All gear sets are manufactured from 8620 triple-alloy steel with advanced heat treatment and quality-tested to exact surface finish standards by Yukon engineers. The Y.E.S. Plan provides lifetime no-questions-asked protection for the gear set kit.

Features and Benefits

• JK Rubicon Dana 44 Specific - The YGK015 is engineered for the high-pinion Dana 44 front and standard Dana 44 rear axles unique to Rubicon JK models, not compatible with non-Rubicon Dana 30 front axles.
• 4.88 Gear Ratio - Compensates for 35 to 40-inch tire diameter to restore highway RPM, acceleration, and off-road crawl performance to near-factory levels.
• Complete Master Overhaul Kits Included - Front and rear kits contain Timken-quality bearings, races, seals, shims, and hardware, eliminating separate component purchases.
• 8620 Triple-Alloy Steel Gears - Computer-controlled forgings from premium alloy steel deliver superior strength, noise reduction, and heat resistance.
• Advanced Heat Treatment - Precise case hardening and tempering develop a hard surface with a tough, ductile core for long gear life under off-road torque cycles.
• Yukon Y.E.S. Plan - Comprehensive lifetime protection plan covers the gear set kit for as long as you own the vehicle, with no dealer restrictions.
• One-Year Manufacturer Warranty - Standard coverage against defects in materials and workmanship.

Vehicle Fitment

Specifications

What is Included

• Front Dana 44 high-pinion ring and pinion gear set, 4.88 ratio
• Rear Dana 44 ring and pinion gear set, 4.88 ratio
• Front master overhaul kit with bearings, races, seals, and shims
• Rear master overhaul kit with bearings, races, seals, and shims

Frequently Asked Questions

• Q: Does the YGK015 fit non-Rubicon JK Wranglers?
  A: No. The YGK015 is specific to JK Rubicon models with Dana 44 axles front and rear. Non-Rubicon JK models use a Dana 30 front axle and require YGK012, YGK013, or YGK014.
• Q: What tire size is 4.88 gears designed for?
  A: The 4.88 ratio is most appropriate for 35 to 38-inch tires. For 38 to 40-inch or larger tires, consider the 5.13 ratio kit YGK016.
• Q: Do the master overhaul kits include carrier bearings?
  A: Yes. The master overhaul kits included with the YGK015 contain carrier bearings, pinion bearings, races, seals, shims, and all small parts for a complete rebuild.
• Q: Is the 2014 Rubicon included in the fitment?
  A: The 2014 Wrangler Rubicon uses the same Dana 44 axles and is compatible with the YGK015 through the Unlimited Rubicon fitment listed.
• Q: How long does installation typically take?
  A: A professional drivetrain shop typically requires 8 to 10 hours per axle for a complete ring and pinion installation including proper setup, backlash, and break-in procedure.
• Q: What is the Y.E.S. Plan warranty?
  A: Yukon's Y.E.S. Plan is a lifetime no-questions-asked gear set protection plan. Under the Magnuson-Moss Warranty Act, this coverage is provided in writing and does not require using any particular dealer or service provider.
• Q: Does this kit include a crush sleeve?
  A: Yes. The master overhaul kits include pinion crush sleeves and all consumables required for a full re-gear installation on both axles.
• Q: Will this work with the Rubicon's factory electronic lockers?
  A: Yes. The ring and pinion gear sets in the YGK015 are compatible with the JK Rubicon's factory air-actuated locker equipped carriers.

Installation Overview

1. Begin with the rear axle: drain fluid, remove cover, and pull axle shafts.
2. Remove the carrier assembly and note all bearing cap orientation markings.
3. Press old carrier bearings off the carrier and install new bearings from the YGK015 master kit.
4. Torque the new ring gear onto the carrier with thread-locking compound per specification.
5. Install the new pinion with new bearings, set pinion depth using marking compound or depth gauge tool.
6. Install a new crush sleeve, assemble the pinion yoke, and set pinion bearing preload with an inch-pound torque wrench.
7. Set carrier backlash to specification (0.006 to 0.010 inch for Dana 44) using side bearing shims.
8. Verify gear contact pattern and adjust until centered on drive and coast faces of the ring gear teeth.
9. Reinstall cover, fill with gear oil, and break in gears with moderate driving for 500 miles before any hard use.
10. Repeat the procedure for the front Dana 44 axle, including re-indexing the front driveshaft if applicable.

California 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.