RTS Pinion Crush Sleeve, 9 Inch Ford, Collapsible Pinion Spacer, 1.630 in. Diameter, .500 in. Thickness, Steel, Natural, EachStock replacement crush collar sleeve for Ford 9 rear axles. Collapsible spacer installs on the pinion and preloads the pinion bearings. Crush sleeves are not reusable. This is designed to be a stock replacement crush collar sleeve for Ford 9" rear axles Collapsible spacer installs on the pinion and preloads the pinion bearings Crush sleeves are not reusable and must be replaced if the pinion nut is loosened or removed Overall diameter measures 1.