Thanks for the info onetirefire! I just read in Rocky Rotella's Firebird & Trans Am book that the '78 Formula (and TA) came with either the 4-speed or automatic standard (no-cost option) M21 when equipped with the W72. It didn't say anything about posi being standard with the W72 (obviously standard on TA). Rocky also said the Formula came with the base TA suspension for 1978 model year to simplify inventory.
Dennis
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