The Ultimate Rubicon Upgrade: Go Big with 35-Spline Locking Power.
The Jeep Wrangler JK Rubicon comes with factory electric lockers, but they have known weaknesses—especially the "smart bar" sensors and the limited strength of the stock axle shafts when running 37-inch or 40-inch tires. The ARB RD157 is not just a replacement; it is a massive upgrade designed to transform your Rubicon’s Dana 44 into a competition-grade axle capable of handling extreme torque.
At Overland Truck Store, we recommend the RD157 for Rubicon owners who are ready to "build it right." This locker is engineered specifically for the Rubicon housing but requires upgrading to 35-spline axle shafts. By stepping up from the stock 30/32-spline shafts to 35-spline, you gain a massive increase in axle strength (approx. 30-40%), ensuring you can twist heavy tires in the rocks without snapping a shaft.
Unlike the factory e-locker which can have engagement delays or electrical gremlins, the ARB uses a reliable pneumatic locking mechanism that engages instantly. It fits both the Front and Rear axles of the JK Rubicon, allowing you to standardize your locker setup and eliminate the factory fail points.
Features & Specs:
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Application: 2007-2018 Jeep Wrangler JK Rubicon & Unlimited Rubicon.
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Axle Type: Dana 44 (Rubicon Housing).
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Spline Count: 35 Spline (Requires Aftermarket Axle Shafts).
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Carrier Break: Fits 3.73 & Down (Numerically Lower) Carrier.
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Position: Fits both Front and Rear differentials.
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Strength: Forged gears and two-piece case designed for 35-spline loads.
Installer Note:
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Shaft Upgrade Required: This locker will NOT fit your stock factory axle shafts. Stock Rubicon rear shafts are 32-spline, and fronts are 30-spline. You must purchase aftermarket 35-spline shafts to run this locker.
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Gear Fitment: This carrier is designed for the "3.73 and Down" deck height. Since most aftermarket gears for the JK Rubicon (e.g., 4.88, 5.13, 5.38) are "Thick" gears, they will bolt right up to this locker. If you are reusing factory 4.10 gears, verify they are compatible with this carrier offset.