In '73, the F-body 400/4 BBL/4 speed received the M-20 or M-21. The 455/4 speed received the M-21. The 455 SD/4 speed received the M-20.
The Formula transmission was a chargeable option, so it will be listed on the invoicing. The Trans Am transmission option was a no charge for either automatic or 4 speed, so no info. was listed on invoicing.
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