sole year for the Town Car coupe with the two-door version of the Mark VI ending production after 1983. After 1987, two-door Ford and Mercury sedans were discontinued due to low demand. After 1991, the Ford LTD Country Squire and Mercury Colony Park station wagons were discontinued. Changes Outside of the shift of nameplates in the early 1980s, few fundamental changes were made to first-generation Panther-platform vehicles from 1979 to 1991. For 1980, Lincoln introduced the AOD 4-speed overdrive automatic transmission and fuel injection for the 5.0L V8, becoming available for Ford and Mercury in 1981 (Canadian Lincolns got fuel injection only in 1984). For 1988, the LTD Crown Victoria and Grand Marquis underwent a minor revision to improve exterior aerodynamics. For 1990, the Panther platform received its first addition of SRS airbags. The Town Car (shifting to the second generation) was designed with dual airbags; the LTD Crown Victoria, Grand Marquis, and station wagons were fitted with driver-side airbags. The 1st-generation Panther was also: The last American car with functional vent windows (option on 1989 Ford/Mercury) The last American-brand car available with a carbureted engine (351 cubic-inch V8; option on Grand Marquis, Crown Victoria wagon/police car through 1991) Second generation (1990–2002) The American automotive landscape had changed significantly throughout the 1980s, although Ford had left the Panther platform essentially unchanged. A combination of changing consumer tastes as well as increasingly more stringent fuel economy standards forced Ford to make significant changes to the Panther cars in order to keep them in production. Bucking industry trends of the time, Ford chose not to downsize it any further or to replace it entirely with a front-wheel drive platform, opting instead for more aerodynamic bodystyling (which had been popularized by the smaller Taurus) and an all-new powertrain. As a result of changing market trends towards minivans and sport utility vehicles, one casualty of the redesign was the Country Squire and Colony Park station wagons; at the time, their de facto replacement was the Ford Aerostar. In October 1989, Lincoln introduced the second-generation Town Car. In early 1991, the Crown Victoria (the LTD prefix disappeared) and Grand Marquis received total redesigns of their bodies for 1992. The Ford was restyled to have more of a family resemblance to the Ford Taurus, while the Mercury was styled as a more contemporary version of its predecessor (a formal family sedan). 4.6-liter "Modular" V8 In 1991,