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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
positraction was an option on all models of cars- you could get a posi differential in a 4 door powered by a 6 cylinder with 2.56 gears and you could get a non posi rear in a 454 powered car with 3.42 gears.