Undoubtedly in 1973 the Trans Am and Formula 455, when equipped with the L75 D-port engine, were equipped with the Muncie-built M21 close-ratio 4-speed.
Formula 400 buyers had to choose between Muncie's M20 and M21 if they wanted a 4-speed. I have PHS invoices for examples with either trans. For years I have been trying to determine if it truly was order-taker selection because it doesn't appear that inclusion was limited to ancillary equipment (such as performance axle or A/C).
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