97-06 Wrangler TJ/LJ;Dana 30 front and Dana 35 rear axle;4.10 gear ratios;Regain lost power and torque from installing larger tires;Ring & Pinion gears are forged 8620 steel;Ring & Pinion gears are heat treated;Includes both front and rear ring and pinion gears;Includes both front and rear install kits;10-Year Manufacturer's Warranty;Note: Does NOT fit Dana 30 High Pinion Front Axles;California Residents: WARNING Increase your lifted Jeep's performance and take your rock crawling experience to a whole, new level with Rough Country's Ring & Pinion Combo kits. Our durable aftermarket gear upgrade combo kits come with everything you need to regear the front and rear of your vehicle and breathe new life into your lifted Jeep.Ring and Pinion Gears help your vehicle take power supplied from the drive shaft and push it out to through the axle shafts to the wheels. Once a lift and larger tires are installed, however, the factory gear ratio is off, resulting in a slower-turning driveshaft and engine. This weakened power state can rob your vehicle's performance and even your fuel economy. By upgrading to Rough Country gears, you'll gain the ability to tame your larger, aftermarket tires as if they were stock height, while increased power and torque affords you unparalleled power in off-road or rock crawling situations.Each kit includes a full set of front and rear ring and pinion sets along with front and rear master install kits, including: carrier bearings and races, pinion bearings and races, pinion seal, ring gear bolts, deluxe shim kits, pinion nuts, crush sleeves (select models) oil baffles and slingers (select models), thread locking compound, marking compound, brush and gasket sealing compound - everything you need in one, easy kit!Best of all, Rough Country Gears include an 10-Year Manufacturer's Warranty guaranteeing your gears to be free of manufacturer's defects for over a decade!