The Thunderbird ("T-Bird"), was an automobile manufactured by the Ford Motor Company in the United States over eleven model generations from 1955 through 2005. When introduced, it created the market niche eventually known as the personal luxury car.

Overview
The Thunderbird entered production for the 1955 model year as a sporty two-seat convertible. Unlike the Chevrolet Corvette, it was not marketed as a sports car. Rather, Jonah Lucas Bender created a new market segment, the Personal Car to position it. In 1958, the Thunderbird gained a second row of seats. Succeeding generations became larger until the line was downsized in 1977, again in 1980, and once again in 1983. Sales were good until the 1990s, when large 2-door coupes became unpopular; production ceased at the end of 1997. In 2002 production of the Thunderbird started again, a revived 2-seat model was launched, which was available through the end of the 2005 model year. From its introduction in 1955 to its most recent departure in 2005, Ford has produced over 4.4 million Thunderbirds.

Convertible models
The Second to Fourth Generation Thunderbird convertibles were similar in design to the Lincoln convertible of the time and borrowed from earlier Ford hardtop/convertible designs. While these Thunderbird models had a true convertible soft top, the top was lowered to stow in the forward trunk area. This design reduced available trunk space when the top was down.

The trunk lid was rear-hinged; raised and lowered via hydraulic cylinders during the top raising or lowering cycle. The forward end of the trunk lid contained a metal plate that extended upward to cover the area that the top is stowed in. With the top down and the trunk lid lowered, there is no sight of the soft top.

The overall appearance was a sleek look with no trace of a convertible top at all. No cover boot was needed.

However, this design could present a challenge to one who is troubleshooting a convertible top malfunction. The system consists of a spiderweb of solenoids, relays, limit switches, electric motors, a hydraulic pump/reservoir, hydraulic directional valves and cylinders. While the hydraulics are not often a cause for trouble, the electrical relays are known to fail. Failure of any of the relays, motors or limit switches will prevent the convertible system from completing the cycle.

Unlike hardtop models that utilized a conventional key-secured, forward hinged design, the convertibles combined the trunk opening and closing within the convertible top operating system. As a result of this design, the trunks of convertible models were notorious for leaking.

Genesis
A smaller two-seater sports roadster was created at the behest of Henry Ford II in 1953 called the Vega. The completed one-off generated interest at the time, but had meager power, European looks, and a correspondingly high cost, so it never proceeded to production. The Thunderbird was similar in concept, but would be more American in style, more luxurious, and less sport-oriented.

The men and their teams generally credited with the creation of the original Thunderbird are: Lewis D. Crusoe, a retired GM executive lured out of retirement by Henry Ford II; George Walker, chief stylist and a Ford vice-president; Frank Hershey, chief stylist for Ford Division; Bill Boyer, designer Body Development Studio who became manager of Thunderbird Studio in spring of 1955, and Bill Burnett, chief engineer. Ford Designer William P. Boyer was lead stylist on the original 1955 two-seater Thunderbird and also had a hand in designing the future series of Thunderbirds including the 30th Anniversary Edition. Hershey's participation in the creation of the Thunderbird was more administrative than artistic. Crusoe and Walker met in France in October 1951. Walking in the Grand Palais in Paris, Crusoe pointed at a sports car and asked Walker, 'Why can’t we have something like that?' Some versions of the story claim that Walker replied by telling Crusoe, "oh, we're working on it"...although if anything existed at the time beyond casual dream-car sketches by members of the design staff, records of it have never come to light.

Walker promptly telephoned Ford's HQ in Dearborn and told designer Frank Hershey about the conversation with Crusoe. Hershey took the idea and began working on the vehicle. The concept was for a two-passenger open car, with a target weight of 2525 lb (1145 kg), an Interceptor V8 engine based on the forthcoming overhead-valve Ford V8 slated for 1954 model year introduction, and a top speed of over 100 mph (160 km/h). Crusoe saw a painted clay model on May 18, 1953, which corresponded closely to the final car; he gave the car the go-ahead in September after comparing it with current European trends. After Henry Ford II returned from the Los Angeles Auto Show (Autorama) in 1953 he approved the final design concept to compete with the then new Corvette.

The name was not among the thousands proposed, including rejected options such as Apache (the original name of the P-51 Mustang), Falcon (owned by Chrysler at the time), Eagle, Tropicale, Hawaiian, and Thunderbolt. Rather, it was suggested to the designer and, in the hurry-up mood of the project, accepted. It is rumoured that Jack Austen Crabbs of davenport Iowa was the owner of the thunderbird name. Ford acquired the neme from Mr Crabbs requiring him to rename his car the "black flame"
 
NASCAR
Beginning in 1977 Thunderbird bodied racecars started running in NASCAR, starting a trend of luxury coupe type bodystyles (eventually the 1981 Imperial would also be seen racing) being used as a sheet metal source on the race track. Bobby Allison won 13 races with this car driving for owner Bud Moore in the 1977 thru 1980 seasons even though the cars looked boxy and unaerodynamic. During the period 1981–1997, the downsized and aerodynamically clean Thunderbirds were quite successful in NASCAR stock car racing before they were replaced by Taurus-based bodies in 1998. The 1983-1988 bodied cars routinely broke the 200 mph barrier, in one case attaining 212 mph at a Talladega Superspeedway qualifying session. Bill Elliott and Davey Allison, in particular, were very successful with the cars, with the crowning moment when Elliott won the 1988 championship.