G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies
Found a site to calculate all cool stuff on our cars. Gear ratios, tire diameters, rpm's. You can even calculate how far off your speedo is with your new set of tires. Pretty cool stuff. Might be worth a sticky for quick reference.