Designed by Dick Teague, the 1963 Ambassador's shape was much tighter, cleaner, and smoother, with almost all of its parts interchangeable between it and the new Classic. All Ambassadors used unitized structure instead of the more rattle-prone, traditional body-on-frame construction which was still the industry standard. In 1963, AMC's new wheelbase cars (Ambassadors and Classics) used a revolutionary method of unit construction which has since been almost universally adopted by automobile manufacturers. AMC Ambassador and Classics used outerpanels stamped from single sheet metal panels which included both door frames and outer rocker panels. This resulted in an extremely rigid and rattle-free structure, better fit of doors into frames, production cost savings and reduced noise, vibration and harshness. The "uniside" structure was superior to the conventional production methods in which multiple smaller pieces were welded together. There were 30% fewer parts and the result was greater structural rigidity, quieter car operation, and an overall weight reduction of about .