- 1978/79–1981 Confirmed
Trans Am; sources differ on ’78 vs ’79 start
Also described as Trans Am GTA packageTrans Am Recaro edition (Trans Am S/E)Merchandised package, Trans Am GTA
Documented applications
- 1987–1992 Confirmed
GM reused Y84; Wikipedia gives the 1982–1984 Recaro Trans Am the same code (another meaning); Firebird years: Wikipedia 1987–1992; 3rdgenformula option pages 1987–1992
- 1983–1984 Single-source
black and gold, Recaro seats; another meaning from the 1987–1992 GTA package; Wikipedia's 1982 text reads "Y82/Y84" for the Recaro edition, so 1982 is not claimed (as for Y82); Firebird years: Wikipedia 1983–1984
- 1998–2002 Factory-verified
2001–2002 lists print "Firebird Trans Am, GTA"
This page aggregates every documented appearance of Y84 in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.