Hot Rod Forum banner
1-1 of 1 Results
  1. Transmission - Rearend
    I have a1985 IROC-Z28 with rear axle ratio of 3.42. My rpo code is GU6. A rpo G92 performance axle ratio is also a 3.42 but concidered as being only 250 cars produced. Does anyone know if there really is a difference?
1-1 of 1 Results