Firebird = V-6 low spoiler
W68 package adds ground effects 3.42 gears posi better suspension tighter steering wheel ratio <-- hope that makes sense
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trans-am diff front fascia raised spolier and the all important V-8 Trans-Am lettering and badges
Formula V-6 body with a V-8 engine. formula lettering and badges
WS6 package adds ram-air hood better suspension diff wheels
Firehawk is just a attempt for GM to charge you more money for a different badge on the same car..lol no but for real its bascially a WS6 with a different hood and firehawk badges and is rated at 345Hp LS1 (98-02) models but has the same engine as a T/a and formy but has a better flowing exhaust and you could either get and Firehawk T/A raised spoiler or Firehawk Formy low spoiler or a special firehawk spoiler but that may be aftermarket
Anybody feel free to correct me if I'm wrong