1946–1960
After wartime restrictions on automotive production were ended, DeSoto returned to civilian car production when it reissued its 1942 models as 1946 models, but without the hidden-headlight feature, and with fender contours extending into the doors, like other Chrysler products of the immediate postwar period.
Until 1952, DeSoto used the Deluxe and Custom model designations. In 1952, DeSoto added the Firedome with its 276-cid V-8 Hemi engine. However, in 1953, DeSoto dropped the Deluxe and Custom names and designated its six-cylinder cars the Powermaster and its V-8 car remained the Firedome. Initially, the 276 cuin DeSoto "Fire Dome" Hemi engine was installed in the French luxury performance Facel Vega.
At its height, DeSoto's more popular models included the Firesweep, Firedome and Fireflite. The DeSoto Adventurer, introduced for 1956 as a high-performance hard-top coupe (similar to Chrysler's 300), became a full-range model in 1960.
In 1955,[6] along with all Chrysler models, DeSotos were redesigned with Virgil Exner's "Forward Look." DeSotos sold well through the 1956 model year. That year, for the first and only time in the marque's history, it served as pace car at the Indianapolis 500.[7] For the 1956 update, Exner gave the DeSoto soaring tailfins fitted with triple taillights, and consumers responded by buying in record numbers.
The 1957 had a well-integrated design, with two variations: the smaller Firesweep body placed on the concurrent Dodge 122-inch wheelbase chassis with Dodge front fenders and the Firedome and Fireflite (and its halo model Adventurer sub-series), based on the larger 126-inch wheelbase chassis shared with Chrysler. As was conventional in the era, subsequent years within the typical three-year model block were distinguished by trim, bumper and other low-cost modifications, typically by adding bulk to bumpers and grilles, taillight changes, color choices, instrumentation and interior design changes and often additional external trim.
The 1958 economic downturn hurt sales of mid-priced makes across the board, and DeSoto sales were 60% lower than those of 1957 in what would be DeSoto's worst year since 1938. Also, Ford Motor Company had introduced new mid-price competitors for the 1958 model year with the Edsel brand. The sales slide continued for 1959 and 1960 (down 40% from the already-low 1959 figures), and rumors began to circulate that DeSoto was soon to be discontinued. 1960 was the last year of DeSoto sales in Canada.