The 1965-66 Impala: The Redesign That Became Chevrolet's Best-Selling Year Ever
In 1965, Chevrolet sold over a million Impalas in the United States alone — still the best single sales year the nameplate has ever had. It's a big reason there are so many '65-66 Impalas out there to restore today, and why parts for this exact two-year window are some of the most in-demand we carry. Here's what actually changed, and why the redesign hit as hard as it did.
1965: An all-new car, not just a facelift
The 1965 Impala wasn't a refresh of the previous body — it was a ground-up redesign. Chevrolet moved off the older X-frame chassis to a full-width perimeter frame with a revised suspension, and gave the car curved, frameless side glass, reshaped vent windows, and a sharper, more angled windshield. The overall look leaned into a forward-tilted front end and a pronounced rise over the rear fenders, tied together with a crisp wraparound character line running the length of the body. It was a distinct enough departure that it's often treated as the start of its own generation of full-size Chevy, and the sales numbers backed up the design bet — over a million sold that year alone.
1966: Minor on paper, but you can spot it
With a hit that big, Chevrolet didn't mess with the formula much for 1966 — but the changes that did happen are easy to spot once you know where to look. The front end got a revised horizontal-bar grille, the taillights switched from the triple round lights Chevy had used on its full-size cars since 1958 to triple rectangular units, and the car picked up new wheel covers, fenders, and an updated trunk lid. Quarter panels also shrank by about an inch compared to 1965. Under the hood, 1966 is the year the Mark IV big-block V8 arrived, topping out at 425 horsepower in its highest state of tune. Impala remained Chevrolet's best-selling model that year too, at more than 650,000 units.
Why the two years aren't interchangeable at the parts level
Because '65 and '66 share the same core body but differ in real, visible details — grille, taillights, quarter panel length, trim — a lot of exterior parts are correct for both years as a pair, but not universally interchangeable with earlier or later full-size Chevys. That's exactly why our listings for this generation, like the mirror set and rear window molding clip set below, are scoped specifically to 1965-66 Impala/Bel Air/Biscayne/Caprice — not a broader "fits all full-size Chevys" claim that would be wrong for a '67 or a '64.