depends on the year. they are all made by GM. in the 80s & early 90s, firebirds, trans ams, and camaros were all the same. late 90s is when they developed different body styles. (i think) the frame and motors were the same, just the bodies were different. same as mitsubishi eclipse/eagle talon/plymoth laser.
No. All Tans Ams are Firebirds but not all Firebirds are Trans Ams. Trans Am is a designated appearance and performance model of the Firebird. All Firebirds were based on the GM F-body platform only (Firebird and Camaro).