Re: Difference between Firebird/TransAm/GTA/Formula etc..
Firebirds were the starting point to them all, from there a formula would add performance, always guaranteed a V8, different ones were available different years, think they dropped the base V8 off later on in production and just made them TPI 305s and 350s. Also they had the best suspension offered to a Firebird, among a different set of 16" wheels. Trans Am added ground effects standard, with a better than base suspension, with the best suspension (WS6) as an option. Fog lights were standard, among the same back wing the Formula's shared. GTA was more of a touring car, I believe WS6 suspension was standard (don't quote me on that) and TPI V8 was standard. Trans Ams also had lumbar support assisted seats that I do not believe Formula's could have. Everything is swappable from one model to the next, and there is nothing really different about them. Start with what you want though because making it what you want can get costly...you can ask me and many others...start with what you want.