The Dodge St. Regis was based on the rear wheel drive
Chrysler R-body platform. As Chrysler needed to expedite a downsized replacement for the 1974–1977 C-body to market (in response to the 1973 oil crisis), the R-body was developed from existing underpinnings at minimal costs. In place of redesigning the full-size C-body, Chrysler developed the R-body as an update of the intermediate B-body (last released in 1971, dating to 1962). Used by a wide variety of Chrysler model lines, the B-body architecture underpinned model lines ranging from the Dodge Coronet and Plymouth Belvedere to the Dodge Charger and Chrysler Cordoba. Compared to its 1977 Dodge Royal Monaco predecessor, the Dodge St. Regis shed 5.5 inches in length, 2.7 inches in width, 3 inches in wheelbase, and nearly 900 pounds of curb weight (dependent on powertrain). The 225 Slant-6 inline-6 was now the standard engine with optional 318 and 360 V8s; a three-speed automatic was paired to all three engines. In deference to fuel economy standards, the 400 and 440 big-block V8s were deleted from the engine lineup. The front suspension continued to offer Chryslers signature longitudinal front torsion bars, called Torsion-Aire, and anti-sway bar with a solid rear differential connected to leaf springs. The "St. Regis" name first saw use as an uplevel trim package on the 1956
New Yorker hardtop coupe and again on the 1974–78
Chrysler New Yorker Brougham coupe. Offered only as a four-door
notchback sedan, the St. Regis was styled with frameless door glass (the rear quarter glass was fixed). To further distinguish the model line from its
Plymouth Gran Fury,
Chrysler Newport, and
Chrysler New Yorker counterparts, the front fascia was styled with transparent retractable headlamp covers (introduced on the 1978
Dodge Magnum). File:lamp_closed.jpg|lights off File:lamp_open.jpg|lights on ==Market timing==