New Ratech solid pinion bearing spacer. Normally, the pinion has a crush sleeve, and as you tighten the pinion nut, the sleeve crushes so you can obtain proper pinion bearing preload. A solid pinion bearing spacer does not crush, so it is much stronger. Instead, you install the spacer and shims to achieve the proper bearing preload. It takes a little more time to install, but is stronger than a crush sleeve. Fits the following:
70-81 Camaro/Firebird w/ GM 10 bolt 8 1/2" rear