Check the listing for details. 8.8" Ford 3.73 Rear Ring & Pinion, Install Kit, 28spl Posi, 2.25" Axle Bearings. Condition: New, Made in CN. Listed at 926.16 USD. 8.8" Ford 3.73 Rear Ring & Pinion, Install Kit, 28spl Posi, 2.25" Axle Bearing. USA Standard 8.8" Ford, 3.73 Ratio Rear Ring & Pinion Gear Set and Master Install Kit Package, with 28 Spline Yukon Dura Grip Limited Slip Positraction, and 2.25" OD Axle Bearing & Seals. USA Standard Gear Re-gear & Traction Kits are an easy way to dramatical increase performance of a differential in one simple part number. The kits package a ring and pinion set, an installation kit, and a Yukon Dura Grip limited slip positraction unit. Yukon Dura Grips provide smooth yet aggressive traction, giving you the confidence and performance you need across a wide variety of terrains. The Dura Grip is engineered for long life and is completely rebuildable.