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The Rarest Muscle Car Transmission In The '60sBut collectors even scrutinize the transmissions they are paired with ... The key difference between the Muncie M20 and M21 gearboxes was that the M20 was the wide-ratio model, while the M21 ...
The GTO was offered standard with a 2-speed automatic transmission, but customers could also get a 3-speed manual replacement with a Hurst shifter. Muncie M20 and M21 transmissions were also ...
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