West Coast Differentials’ Gary MacFayden explains:
"West Coast Differentials now stocks Sierra Gear ring and pinion sets and installation kits for the 2007 and newer Jeep JK. These gears come in 4.88, 5.13 and 5.38 ratios for the Dana 44 front and rear differentials and 4.88 and 5.13 for the Dana 30 front. The Dana 44 ring gears have been double drilled to fit both carriers. We personally tested the prototypes and they installed with good patterns using the factory shims.”