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.
Year-by-year totals per the GTA Source Page registry (transcribed from GM internal usage printouts): 1987 = 9,481 (269 export, 1,509 Canadian — first year of the GTA package); 1988 = 11,218 (192 export, 1,261 Canadian); 1989 = 9,631 (204 export, 952 Canadian); 1990 = 1,447 (304 export, 259 Canadian); 1991 = 2,915 (407 export, 476 Canadian); 1992 = 508 (234 export, 48 Canadian — final year of the third-gen F-body, with most production shifted to non-GTA Trans Am packages as the model wound down). Total Y84 production 1987–1992 ≈ 35,200 cars across all engine and trim combinations. 1992 was the smallest year by far; 1988 was the peak year. Phil's 1991 GTA is one of 2,915 from that year.
