The 1984 Ford Thunderbird only made minor changes from the previous model year. The 1984 Ford Thunderbird has 3.8 L Essex V6 and 4.9 L (302 cu in) Windsor 5.0 V8 which have been carried over from the previous generation with the V8 engine gaining CFI electronic fuel injection. Optional is a Turbo Coupe." This is a turbocharged and electronically fuel-injected version of Ford's 2.3-liter, OHC four making 142 hp. Mated to a five-speed manual transmission