Quote:
Originally Posted by 'ol Pinion head
'70 455 GTO's with a Muncie 4spd recieved the DP coded M21 whether 3.31 or 3.55 rear axle.
'71 & 72 A-body's factory equipped w 455 HO engines recieved an M22 when 4spd was ordered. Again a 2.20 first gear Muncie mated with a 3.31 rear axle (AC cars), or a 3.55 axle in non AC applications.
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Interesting! I was not aware of that thank you
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