For 1963, the Grand Prix received revised sheetmetal shared with other full-size Pontiacs, but with its own squared-off roofline with a concave rear window that contrasted with the convertible-like roofline of the 1962 Grand Prix and continued on the 1963 to 1964 Catalina and Bonneville.
Also new was a Pontiac-trademark split grille with vertical headlights and round parking lights and "hidden" taillights.
Aside from grillework, taillight covering and bumpers, chrome trim was limited to lower rocker panels, wheel arches and roofline.

Inside, the GP continued with luxurious interiors featuring real walnut trim on the instrument panel and bucket seats upholstered in Morrokide vinyl.
 The center console was now built into the instrument panel and featured a vacuum gauge to go along with a dash mounted tachometer (manual transmission).
Pedals received revised custom trim plates.
A wide assortment of options were available including power steering, brakes, windows and driver's seat; air conditioning, eight-lug aluminum wheels with integrated brake drums, Safe-T-Track differential and other items.
New options this year included an AM/FM radio, cruise control and a tilt steering wheel adjustable to seven positions.

The 303 hp (226 kW) 389 four-barrel V8 remained the standard engine.
A new lineup of optional engines was introduced this year which included the 330 hp (250 kW) 389 Tri-Power and three versions of the larger 421 in³ V8 including a standard four-barrel version rated at 320 hp (240 kW), a 350 hp (260 kW) Tri-Power option, and the 421 HO option with Tri-Power carburetion and 370 hp (280 kW).
The same selection of transmissions continued including the standard three-speed manual, optional four-speed manual, or three-speed Roto Hydra-matic.
Brakes were 11 in (28 cm) drums.
For 1963, the Grand Prix received revised sheetmetal shared with other full-size Pontiacs, but with its own squared-off roofline with a concave rear window that contrasted with the convertible-like roofline of the 1962 Grand Prix and continued on the 1963 to 1964 Catalina and Bonneville. Also new was a Pontiac-trademark split grille with vertical headlights and round parking lights and "hidden" taillights. Aside from grillework, taillight covering and bumpers, chrome trim was limited to lower rocker panels, wheel arches and roofline.
Inside, the GP continued with luxurious interiors featuring real walnut trim on the instrument panel and bucket seats upholstered in Morrokide vinyl.  The center console was now built into the instrument panel and featured a vacuum gauge to go along with a dash mounted tachometer (manual transmission). Pedals received revised custom trim plates. A wide assortment of options were available including power steering, brakes, windows and driver's seat; air conditioning, eight-lug aluminum wheels with integrated brake drums, Safe-T-Track differential and other items. New options this year included an AM/FM radio, cruise control and a tilt steering wheel adjustable to seven positions.
The 303 hp (226 kW) 389 four-barrel V8 remained the standard engine. A new lineup of optional engines was introduced this year which included the 330 hp (250 kW) 389 Tri-Power and three versions of the larger 421 in³ V8 including a standard four-barrel version rated at 320 hp (240 kW), a 350 hp (260 kW) Tri-Power option, and the 421 HO option with Tri-Power carburetion and 370 hp (280 kW). The same selection of transmissions continued including the standard three-speed manual, optional four-speed manual, or three-speed Roto Hydra-matic. Brakes were 11 in (28 cm) drums.
Pontiac Grand Prix