Y84 is the GTA — Gran Turismo Americano — package, Pontiac's top-of-the-line third-generation Trans Am from the 1987 introduction through 1992 end-of-line. Standard kit included the L98 5.7L TPI engine (B2L callout), WS6 special performance suspension, gold cross-lace cast-aluminum 16-inch wheels, articulated leather Lear-Siegler bucket seats, GTA-specific badging on the rear deck and B-pillar, and the body-color treatment that marks the car as visually distinct from a regular Trans Am.
Designer — the Trans Am body that the GTA package layers on top of was the work of John Schinella's Pontiac No. 2 Studio, with early Advanced-Studio sketches by Roger Hughet under Bill Porter's direction. Schinella took over as Pontiac design head during third-gen development and is credited with successfully lobbying for a lower nose with pop-up headlamps — the styling cue that distinguishes the Trans Am front end from the Camaro's. Schinella later led the Pontiac Studio into the 1993 fourth-generation F-body.
Production volumes are small relative to the Trans Am line as a whole. By 1991–92 — the years of Plenum's 91-92 silhouette — many GTAs were ordered with the 5.0 LB9 TPI as a $300 credit option on the engine line; the package retained Y84 designation regardless.
