COMPLETE KIT: Provides all of the necessary parts for a differential overhaul in one simple part number - Includes front and rear ring & pinion sets and master overhaul kit - save time and money, and get the exact parts you need for your specific installation. FITMENT: Specifically designed to fit TJ vehicles with Dana Spicer 30 front and Dana Spicer 44 rear axles GEAR RATIO: Kit fits 4.88 gear ratio, offering improved torque and power delivery - this ratio is well-suited for off-road adventures, providing excellent crawling ability and enhanced performance on challenging terrains. RIGOROUSLY TESTED: USA Standard Gear employs rigorous in-house quality testing and inspections, that go beyond OEM specifications, to ensure dimensional, material, and fitment testing is passed, ensuring the gears are ready to withstand the rigors of everyday commuting, trail running, and all types of spirited driving. TRUSTED BRAND: USA Standard Gear sets the benchmark for quality OE replacement parts at affordable prices. Designed for the general installer and do-it-yourself customer, USA Standard Gear products provide unmatched reliability and the assurance that your vehicle is repaired for the long haul.