I installed an aftermarket "Auburn" Posi with Richmond 4:11 gears. The rear tires are: "BFG" 275/50/15 on 15X8 rally's & the fronts are: 225/60/15 on 15X7 rally's. The exhaust is 2.5 inch aluminized with Edlebrock RPM Series Mufflers (better sound and performance than Flow Masters, "personal opinion.") The best part is that the exhaust is bolted to a set of "1 5/8 inch" Ceramic Coated Hooker Headers.