It was based on the GM X platform along with the Oldsmobile Omega, Chevrolet Nova, and the Pontiac Ventura.

[3] The Apollo was powered by a standard 250-cubic-inch (4.1 L) Chevrolet inline six or an optional 350-cubic-inch (5.7 L) Buick V8, available with either a two- or four-barrel carburetor.

[4] Options included variable-ratio power steering, power drum or power front disc brakes, E78x14 bias-belted tires, custom cloth interior trim, convenience center storage compartment, tilt steering wheel, climate control air conditioning with low Freon detector switch, rear window defogger (blower), tinted glass, sport mirrors with drivers remote control, bumper protective strips with white accent stripe- front and rear, bumper guards front and rear, color-coordinated body protective side moldings, deluxe wheel covers, deluxe wire wheel covers, chrome-plated styled wheels (Buick rally wheels) and a custom vinyl top.

A GSX package became available on the coupe for 1974, however, it was purely cosmetic changes, lacking the performance upgrades that distinguished it in previous years.

The 1975 Apollo was only available as a four-door sedan and adopted the redesigned X-body shell with a boxier European look which replaced the former Coke-bottle shape.