For 1966, the Barracuda received new taillights, new front sheet metal, and a new dashboard. The latter had room for oil pressure and tachometer gauges on models so equipped. The 1966 front sheet metal which, except for the grille, was shared with the Valiant, and gave a more rectilinear contour to the fenders. Deluxe models featured fender-top turn signal indicators with a stylized fin motif. The bumpers were larger, and the grille featured a strong grid theme. A center console was optional for the first time.
Although the first Barracudas were heavily based on the contemporary Valiants, Plymouth wanted them perceived as distinct models. Consequently, the "Valiant" chrome script that appeared on the 1964 model's trunk lid was phased out on the 1965 model in the U.S. market, and the large stylized "V" trim above the deck lid was changed to a unique Barracuda fish logo for 1966, though in markets such as Canada and South Africa, where Valiant was a marque in its own right, the car remained badged as Valiant Barracuda until the A-body Barracuda was discontinued.