Triumph TR3A
The Triumph TR3A, produced from 1957 to 1962, represents the most successful and refined iteration of the TR3 series and was instrumental in establishing Triumph as a major force in the American sports car market. While officially Triumph never designated it as the 'TR3A' — internally it was simply a continuation of the TR3 — the distinctive full-width grille and other improvements led the press and public to coin the name, which has stuck ever since.
The TR3A's most visible difference from the earlier TR3 was its revised front end. The narrow mouth grille of the original TR3 was replaced with a wider, full-width grille that gave the car a more modern and aggressive appearance. New door handles, an improved interior with a full-width dashboard fascia, and better weather equipment (including an improved hood/top) completed the external changes. While the modifications were relatively minor, they gave the TR3A a more finished, polished appearance that appealed particularly to the American market.
Mechanically, the TR3A retained the proven 2.0-liter four-cylinder engine producing 100 horsepower through twin SU carburetors. This engine was a development of the original Standard Vanguard unit, progressively refined by Triumph's engineers to deliver more power and reliability. The powerplant was robust and tractable, with a pleasing exhaust note and sufficient torque for spirited driving. A four-speed manual gearbox was standard, with an overdrive unit available as a popular option that effectively created a five-speed transmission.
The TR3A's claim to technical fame was its front disc brakes, which had been introduced on the TR3 in 1956, making it one of the first mass-production cars anywhere in the world to offer disc brakes as standard equipment. The Girling disc brakes provided a significant improvement in stopping power and fade resistance compared to the drum brakes used by competitors, and gave Triumph a genuine marketing advantage.
The chassis was a traditional separate frame with independent front suspension (double wishbones and coil springs) and a live rear axle on semi-elliptic leaf springs. While not as sophisticated as some competitors, the TR3A's chassis provided honest, predictable handling that rewarded skilled driving. The car's relatively light weight — approximately 953 kilograms — meant the 100 horsepower was sufficient for genuinely enjoyable performance.
In the American market, the TR3A was a sensation. It offered genuine sports car driving at a price that undercut the MGA and Austin-Healey 100, its primary competitors. American buyers loved its no-nonsense character, reasonable reliability (by British standards), and the excitement of open-top motoring. The vast majority of TR3A production — over 80% — was exported to the United States.
The TR3A was also successful in competition. While not a dedicated race car, it performed creditably in club racing, rallying, and the demanding SCCA production car classes in America. Its robust engine and simple, maintainable mechanicals made it a popular choice for amateur racers.
Total TR3A production reached approximately 58,236 units, making it by far the most numerous TR3 variant. Today, the TR3A is one of the most popular classic British sports cars, supported by an enormous community of enthusiasts and excellent parts availability. Its combination of honest performance, classic styling, and the joy of basic, elemental motoring makes it an enduring favorite.
Rust is the primary concern — check chassis frame, inner sills, floor pans, inner wings, bulkhead, and boot floor. The separate chassis is easier to restore than a unitary body but can hide significant corrosion. The 4-cylinder engine is robust and well-supported with parts. Overdrive models command a 10-15% premium. Check for correct Girling front disc brakes (a key feature). Wire wheel cars are more valuable than disc wheel versions. Bodies were partly made from aluminum panels — check for electrolytic corrosion where aluminum meets steel. The parts supply is excellent, with virtually every component available as new reproduction. Left-hand-drive US-market cars are the most common; right-hand-drive UK-market cars are rarer.
Approximately 58,236 TR3A units produced from 1957 to 1962. Over 80% were exported to the USA. A final version, sometimes called the TR3B (1962), was produced with a 2.2-liter engine and synchromesh gearbox as a transitional model before the TR4 launch. Triumph never officially used the TR3A designation — it was a press and public invention.