Jeep Wrangler JK, R/P kit, JK D30 D44 4.88, Ring & Pinion Package for Jeep Wrangler JK with Dana 30 Front and Dana 44 Rear, 4.88 Ratio, Currie Legacy Gear Packages for the 2007-2018 Jeep Wrangler JK are complete kit including both front & rear Ring and Pinion gears plus complete installation kits with all the parts needed for assembly. Gears forged from 8620 alloy steel for the greatest strength, precision machined for exact factory fit and quiet operation. All Currie Legacy gears are CNC lapped for reduced friction and provide quiet operation, with additional attention to detail of hand dressing each gear to eliminate any possible burrs on gear tooth edges to improve the break-in process. Our installation kits include the highest grade OE quality bearings to ensure reliable operation.