Not much was changed for the 1966 Mustang due to great sales from previous years. However, 14-inch tires came standard on all models and the GT’s instrument cluster was made standard on all models.
The 1969 Charger received minor changes to distinguish itself from the previous year with a new split front grille and new full-width tail-lamps. A six-cylinder was introduced as the base engine and was under-powered for the mass of the Charger.
Carroll Shelby and Ford collaborated to produce the GT-350 that was a fastback specially tuned by Shelby and produced 306hp in street tune, but 360hp in special GT-350R race tune.
The 1968 Camaro was almost visually identical to the ’67, with the exception of new front and rear side marker lights and vent-less door glass. What really made the ’68 Camaro stand out was big engines, upgraded suspension, and special equipment features.
American Motors 1970 AMX advertising headlined, "We made the AMX look tougher this year because it's tougher this year". They were mildly face-lifted resembling the first two model years, but the changes were different enough to be a separate design for 1970.