3.21 Ratio Ring and Pinion Kit

The USA Standard Gear ZGK2085 is a comprehensive re-gear and traction kit designed to significantly enhance differential performance in a single part number. The Yukon Dura Grip offers smooth yet aggressive traction, engineered for longevity and rebuildability with a high-strength nodular case, forged 4320 chromoly spider gears, and composite clutches. This specific kit includes a 3.21 Ring & Pinion Gear Set, suitable for applications requiring a 12-bolt rear cover and a 12-bolt ring gear. The kit features a 9.25" ring gear diameter and provides a one-stop solution for differential upgrades, offering improved traction and an updated gear ratio. USA Standard Gear ensures quality through rigorous in-house testing for dimensional accuracy, material integrity, and fitment. The included Master Install Kit contains all necessary small parts for a quick and efficient installation, including Koyo bearings, axle bearings and seals, pinion nut and seal, crush sleeve or preload shims, ring gear bolts, carrier and pinion shims, and marking compounds. This ensures vehicles can be back on the road quickly and reliably. The kit also comes with an instruction manual for guidance during installation.