The 1969 restyle increased body length by 3.8 inches (97 mm) (with the wheelbase remaining at 108 inches) and width by almost half an inch. This was the first model to use quad headlamps placed inside and outside the grille opening. The corralled grille pony was replaced with the pony and tribars logo, set off-center to the drivers side.
It featured a 302 cu in (4.9 L) V8 engine with 220 hp (164 kW). The 351cid V-8 was introduced in 1969, and was available with 250 or 290 hp.
Car longer than previous models and sported convex rather than concave side panels. The new Mach 1, with a variety of new powerplants, added many car styling and performance features. It used dual exhausts and steel wheels with bold-lettered Goodyear Polyglas tires. Reflective striping was placed along the body sides, with a pop-off gas cap, matte-black hood with simulated air scoop and NASCAR-style cable and pin tiedowns. A functional "shaker" hood scoop which visibly vibrated by being attached directly to the air cleaner through a hole in the hood was available, as were a tail-mounted wing and chin spoilers and rear window louvered blackout shade. The Boss 302 Mustang was created to meet Trans Am rules and the Boss 429 was created to homologate that engine for NASCAR use, it featured distinctive hockey-stick stripes. Also for the first time Grande appeared - it was deluxe trim available for hardtop only. Fastback body version was renamed Sportsroof.