Starting in the 1960 model year, Chrysler built all their passenger cars with Unibody (unit-body or monocoque) construction, except the Imperials which retained body-on-frame construction until 1967.
Chrysler thus became the only one of the Big Three American automakers (General Motors Corporation, Ford Motor Company, and Chrysler) to offer unibody construction on the vast majority of their product lines.
This construction technique, now the worldwide standard, offers advantages in vehicle rigidity, handling, and crash safety, while reducing squeak and rattle development as the vehicle ages.
Chrysler's contributions to the technology included the first use of computers to design unit-body cars, and the first setup where exterior sheet metal was not required for structural strength, making sheet metal replacement easier.
The 1960 Valiant was the first production automobile with an alternator (generating alternating current, paired with diodes for rectification back to direct current) rather than a direct current electrical generator as standard equipment. It proved such an improvement that it was used in all Chrysler products in 1961.