The 1964 Grand Prix received minor appearance changes from the 1963 edition.
Those included a revised grille (based on the 1964 Bonneville/Catalina) with new "GP" logos and rear deck trim with new taillights, still hidden, again following the shape of the other big '64 Pontiacs.

Revised upholstery trims highlighted the interior, still featuring expanded Morrokide vinyl bucket seats and console as standard equipment.

Engine offerings were mostly unchanged from 1963 except that the standard 303 hp (226 kW) 389 four-barrel V8 gained three 3 hp (2.2 kW), with the extra-cost Hydra-matic transmission.
The standard three-speed manual and optional Hydra-matic transmissions were unchanged from 1963, however, a new GM-built Muncie four-speed available in either a wide-ratio M-20 or close-ratio M-21 options replaced the Borg-Warner T-10.
The 1964 Grand Prix received minor appearance changes from the 1963 edition. Those included a revised grille (based on the 1964 Bonneville/Catalina) with new "GP" logos and rear deck trim with new taillights, still hidden, again following the shape of the other big '64 Pontiacs.
Revised upholstery trims highlighted the interior, still featuring expanded Morrokide vinyl bucket seats and console as standard equipment.
Engine offerings were mostly unchanged from 1963 except that the standard 303 hp (226 kW) 389 four-barrel V8 gained three 3 hp (2.2 kW), with the extra-cost Hydra-matic transmission. The standard three-speed manual and optional Hydra-matic transmissions were unchanged from 1963, however, a new GM-built Muncie four-speed available in either a wide-ratio M-20 or close-ratio M-21 options replaced the Borg-Warner T-10.
Pontiac Grand Prix