Full-size series 1954 The Belvedere replaced the Cranbrook as the top-line offering for 1954. Now, a separate model instead of just a two-door hardtop, it was also available as a convertible, two-door station wagon, and four-door sedan. The two-door hardtop version was now called the "Sport Coupe". The 1954 Belvederes featured full-length rocker sill moldings. Minor styling updates adorned the carry-over body design. For the first time, small chrome tailfins appeared on the rear fenders. An entry-level nameplate was introduced, called the Plymouth Plaza sharing the same design and technology at a lower price. In March 1954, Plymouth finally offered a fully automatic transmission, the Chrysler PowerFlite two-speed. Also new was a larger standard engine: a I6 that was also used by the Dodge Division. Power was now rated at . Belvedere production totaled 32,492 for the year. 1955–1956 All Plymouths underwent a major overhaul for the 1955 model year. This was the first year of Chrysler stylist Virgil Exner's "Forward Look." The Belvedere returned as top-of-the-line, and the Plaza remained the entry-level model. Chrysler promoted the all-new appearance, showing cars built at the Lynch Road Factory in a featurette movie Here. Midway through the model year (on February 26), the engine's stroke was increased by a quarter inch, increasing displacement from and increasing power from . For 1956, Plymouth styling evolved from that of the 1955s. Most notable would be the introduction of the first push-button automatic transmission to appear in an American automobile, and a more dramatic rear-end treatment highlighted by a pair of rakish tail-fins. In early 1956, the Fury joined the Belvedere line as a special-edition high-performance coupe. Belvedere remained the top full-line series through 1958. In 1956, Plymouth added seat belts. In 1956, Chrysler's chief engineer in a public relations campaign took a Belvedere and had a Chrysler turbine engine fitted instead of the standard gasoline engine, and was driven across the US. The 1956 models came with more V8 power upgrades, up to 180 bhp 270cid V8, 187 bhp 277cid V8, 200 bhp 277cid V8, with a 240 bhp 303cid V8 for the Fury. Tail fins featured for the first time, in what Exner described as the "Forward Look". 1957–1959 The 1957 model year had high sales for the Chrysler Corporation, and for the Plymouth line. Plymouth's design was so revolutionary that Chrysler used the slogan "Suddenly, it's 1960!" to promote the new car.