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'71 RPO Question



Sorry if these are dumb questions, but is there any way for me to tell whether my car came with RPO M21 (4-speed Manual Transmission, Close Ratio) or M22 (4-speed Manual Transmission, Close Ratio, HD)? I can't find the tank sticker and don't have the original papers.

Also, what does having the M22 mean performance wise??

Barb :w

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