Quote:
Originally Posted by JL8Jeff
Actually, you mean M20. M21 is a Muncie, M20 just means a wide ratio 4 speed transmission. If you ordered the close ratio, you got the Muncie M21 or M22 if you paid extra for the HD. The standard wide ratio was the Saginaw with the low horsepower engines and the Muncie M20 with the higher hp engines. My Z28 has an M20 Muncie. I've seen COPO 427 cars with the M20. That also brings up the mistake that COPO means high performance options. It doesn't, is just means a non standard RPO which translates to a Central Office Production Order like taxi cabs or fleet cars/trucks. COPO does not always mean high performance. Just like the X11 code on the 69 Camaro does not always mean the car is an SS like some of the books say. It just means the style trim group. I had a 69 Camaro conv 6 cyl car with the X11 trim tag. I think it was an SS 250!  |
Nope, my car came factory with BW ST10. RPO M21
http://www.nastyz28.com/camaro/camaro77.php#rpo
M21 Transmission, 4-speed close ratio (Z28 only) 5,114