>I wonder if any rpo "close-ratio 4 speeds were installed in ANY camaros between I hesitate to say "none" because that's pretty concrete. Gear ratios on the 1977 Camaro range between 2.56, 2.73 & 3.08. None of those justify or require the close-ratio. Then comes the Z28. 3.42 (automatic) or 3.73 (4-speed). So now the M21 comes into play. There's a G92 "performance axle" available. But you can't put it on a Z28, and if you put it on anything else, you get the 3.08 gear.