Regain Your Power. Master the 4.88. Gear Up for the Trail.
The Yukon YGK013 is a complete front and rear differential package engineered specifically for the non-Rubicon Jeep Wrangler JK (2007–2018). This kit simplifies the re-gearing process by combining high-performance 4.88 ratio ring and pinion sets with Yukon's renowned Master Overhaul Kits under a single part number. Crafted from high-grade 8620 triple-alloy steel, these gears are designed to run cooler and quieter than stock while providing the strength needed for technical rock crawling and heavy trail use.
By moving to a 4.88 ratio, you effectively compensate for the power loss and shifted power bands caused by 35-inch or larger tires. The included Master Overhaul Kits are the most complete on the market, featuring premium Timken bearings, races, seals, and all necessary shims and hardware for a professional-grade installation. This kit ensures your Jeep maintains an optimal crawl ratio off-road and better efficiency on the highway, making it an essential upgrade for any serious overland build.
Key Features
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Complete Axle Coverage: Includes components for both the Dana 30 front and Dana 44 rear differentials.
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Optimized 4.88 Ratio: The ideal gearing for JK owners running larger tires who want to regain torque and towing power.
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Master Overhaul Components: Comes with Timken bearings, pinion seals, crush sleeves, ring gear bolts, and marking compound.
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Superior Materials: Gears are heat-treated and tested to exceed OE specifications for durability and surface finish.
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Single-Part Convenience: Eliminates the guesswork of sourcing individual shim packs and bearing sets.
OTS Shop Insight
Tech Tip: If your JK currently has the 3.21 factory ratio, please note that you will need to purchase a new front carrier case to accommodate these 4.88 gears. This is a common requirement for Dana 30 front axles when jumping to a higher numerical ratio. We can help you source the correct carrier to ensure your installation goes smoothly the first time.