When Fitch returned to the U.S., he was among many young pilots who had developed the need for speed during the conflict. Fitch opened an
MG car dealership and also began racing an
MG-TC at tracks like
Bridgehampton,
Thompson, and
Watkins Glen. Unlike many of his contemporaries, Fitch was good. So good in fact, he caught the attention of the wealthy racing enthusiast,
Briggs Cunningham, who encouraged Fitch to start the 1951 season racing in Argentina. in which Fitch won the
1953 12 Hours of Sebring with
Phil Walters. In his most notable year, 1953, Fitch and co-driver
Phil Walters defeated the powerful
Aston Martin team in the
12 Hours of Sebring, in a
Chrysler-powered Cunningham C4R, much to the surprise of the English team's manager,
John Wyer. He thought he had the race won, "I never imagined anyone would beat us. Especially not Americans." It was the first
Sebring victory for American drivers in an American car. Fitch competed in many European races that year and was named "Sports Car Driver of the Year" by
Speed Age magazine. In addition to again racing a Cunningham C4R and
Cunningham C5R for the Cunningham team, competing in European rallies in a Sunbeam-Talbot for the Sunbeam team, and racing a Porsche 356 at Nürburgring, he also competed in the Mille Miglia in a
Nash-Healey for the factory team, the
Aix-les-Bains Grand Prix in a
Cooper Monaco for the
Cooper team, the
RAC Tourist Trophy race in a works
Frazer Nash, then made the first of two starts in World Championship Grand Prix, failing to finish the
Gran Premio d'Italia in a
HWM-Alta at
Monza, and took his rookie test for the
Indy 500 in a
Kurtis-Kraft-
Offenhauser but did not qualify for the race. However, whilst racing a Cunningham C5R, Fitch survived a frightening 140-mph, end-over-end crash during the
12 Heures internationales de Reims. In 1954, Fitch drove for Cunningham in a Cunningham C4R, and also
Ferraris, and again a Mercedes-Benz 300 SL. For 1955, Fitch raced for the
Daimler-Benz AG sports-car team alongside
Juan Manuel Fangio,
Karl Kling, and
Stirling Moss, arguably the most formidable racing team ever, dominating all levels of competition from
Formula One to
diesel-engined production cars. That year, Fitch won the Gran Turismo oltre 1300 class in the
Mille Miglia in at the wheel of a stock production Mercedes-Benz 300 SL, coming in fifth overall behind his team-mates Moss and Fangio in their
Mercedes-Benz 300 SLR racers. Fitch reported that the suspension was so bad, "we had to stop and tie down the axle with our belts." Yet he was only beaten by dedicated race cars. Fitch also played a hand in Moss's victory, when he conceived and built the famous "scrolling map in a box" device use by Moss's navigator
Denis Jenkinson, to guide their 300 SLR through the treacherous course. Later that season, he partnered with Moss to win the
RAC Tourist Trophy at the
Dundrod Circuit, in Northern Ireland. He found the narrow circuit to be dangerous and unfit for motor racing, as did other drivers; and the Tourist Trophy moved to the Goodwood Circuit in England. Meanwhile, he took ninth in his final World Championship Grand Prix at Monza, driving a
Maserati 250F in the Gran Premio d'Italia. Prior to Tourist Trophy, Fitch was paired with
Pierre Levegh in a 300 SLR, at the
Le Mans. It was Levegh driving at the time of the
worst accident in racing, killing 83 spectators, and, in the initial confusion, had Fitch's family in the United States notified he had crashed. At the time of the accident, Fitch was in the Mercedes trailer after a coffee with Madame Levegh, just behind the pits. When they heard the explosion, Fitch told Madame Levegh, "Wait here, I'll see what's happened." Finding everything in chaos, he helped some injured gendarmes and journalists. Then he returned to the trailer. "I suppose my grim face must have told it all, for I didn't have to speak. Madame Levegh nodded slowly. 'I know, Fitch. It was Pierre. He is dead. I know he is dead.'" The incident sparked his lifelong interest in
safety innovations for racing and highways. When he returned from racing in Europe at the end of the '55 season, Fitch was chosen by Chevrolet Chief Engineer
Ed Cole to head the new eight-driver
Chevrolet Corvette racing team for two years. Although the Corvette was at that point widely panned in the racing community as more style than substance, under Fitch's management the year began with setting a class
land speed record for production cars at
Daytona Beach of 145.543 mph, followed by two class wins and a team win at Sebring. During this period, Fitch continued to race successfully with the
Cunningham team, which was now competing around the United States in
Jaguar D-Types. He was both team manager and driver for the appearance of the
Corvette SS at the
1957 12 Hours of Sebring. By the end of 1957, Fitch had begun racing in
Maseratis, which he continued to race in 1958, mostly at the new Lime Rock Park, where he had been instrumental in the promotion of the track and where he was circuit director. After that, Fitch and Cunningham teamed up to race a two-litre Maserati at endurance events at Sebring and
Road America through 1961, and a
Jaguar E-Type at Sebring in 1962 and again in 1963. Fitch also raced a
Genie BMC in 1963, then returned to Cunningham to drive a
Porsche 904 at Sebring in 1965 and 1966. The poignant tale of his last race begins at the
1966 Sebring event. Fitch, Cunningham, and Dave Jordan were sharing a Porsche. Well into the race, a valve broke and the car was out of contention. By this time, Fitch and Cunningham were no longer enthusiastic about competing to win; according to Fitch, "The thought that this would be our last race never occurred to us. There was a feeling, though, that we weren't really planning to win. In the past, we usually tried to work out a strategy to win, but not this time. I think we were there because we just liked to drive. And at Sebring we could, for 12 hours! Besides, it was the best place to watch the race." So, when a valve broke on the car in 1966, it marked the end of their racing careers for both of them. Fitch continued to drive in
vintage racing events, particularly at Lime Rock Park, as well as at
Goodwood Festival of Speed and the
Monterey Historic Automobile Races. Fitch did, however, return to official automotive competition at 87 years of age in 2003 and again in 2005, when he was once again teamed up with a now 50-year-old Mercedes-Benz 300 SLR owned by Bob Sirna, this time at
Bonneville Salt Flats in an attempt to break the land speed record for the class, a novel venue for both car and driver. The attempts failed due to the
fuel injection pump which limited the top speed to only 150 mph, but the team vowed to return the next year. With characteristic self-deprecating humour, Fitch noted that he had driven those cars faster than that in the rain, at night, on a road with 60 other cars. The extraordinary event is documented in a film by Chris Szwedo entitled
A Gullwing at Twilight: The Bonneville Ride of John Fitch. For few years earlier, Fitch did set a speed record – for driving backwards, reaching 60 mph, set at Lime Rock. ==Engineering==