For 2005, Ford adds a 50th commemoration version to its two entryway Convertible line-up. The 2005 Ford Thunderbird is offered in Deluxe, Premium and 50th Anniversary trim levels with creation for the Thunderbird planned to end this model year. The Thunderbird is furnished with a standard 280 strength 3.9-liter V8 and a 5-speed programmed transmission.