Ratech Solid Pinion Bearing Spacer w/ Shims - GM 12 Bolt (Passenger) 91929929 Hassle-Free Installation:

Hassle-Free Installation:

Once that's done

MSD has a distributor for it

1971-1973 Ford Mustang CID 351 GAS

and then induction hardened to Rc48

Ratech Solid Pinion Bearing Spacer w/ Shims - GM 12 Bolt (Passenger) 91929929 Hassle-Free Installation:Solid Pinion Bearing Spacer with Shim Pack 12 Bolt GM Axle (Auto)Replaces the stock crush sleeve, eliminates bearing failure, reusable. Ratech wants all racers to know about The Myth that "All Shim Packs in the market are the same. They're just washer shaped steel that come in different thickness." WRONG! Ratech manufacture all of their shims in house on their own machinery. Ratech uses the absolute finest American made Hardened Shim Stock available.