The Dodge Dynasty is related to the Chrysler New Yorker; both car lines were built on the Chrysler C platform in Belvidere, Illinois. It is also similar to the Chrysler New Yorker Fifth Avenue and Chrysler Imperial, which were available from 1990 to 1993 on an extended wheelbase platform of the Chrysler New Yorker. The Lee Iacocca-dictated styling was boxy and conservative compared to more aerodynamically styled competitors such as the Ford Taurus. Dynasty trim levels included base and LE. Additionally, a "Brougham" package was offered on 1992–93 LE models that added a padded "landau" vinyl roof. When the new front-wheel-drive Chrysler Corporation C-body cars (Dynasty and New Yorker) debuted for the 1988 model year, they were the first mass-produced cars in the world to have a fully multiplexed, fiber-optic wiring buss connecting all electronic accessories and controllers. This greatly reduced the amount and weight of wiring harnesses in the car. All models (1988–1993) featured power locks that automatically locked when the car's speed exceeded 15 miles per hour.