GM Chevy 8.5" Chevy 10-Bolt Rearend Posi - 30 Spline, Gear, Bearing Kit Package - 3.73 Ratio BRAND NEW Chevy 8.5" Yukon Dura-Grip (Clutch) Posi Unit (30 Spline) BRAND NEW Chevy 8.5" Ring & Pinion (3.73 Ratio) BRAND NEW Chevy 8.5" Master Bearing/Installation Kit