Apart from a different name, the most noticeable change between the two stable mates was the egg-crate grille covering the radiator cooling intake.
Proving that outward appearances can be deceptive, the TR 3 was much more powerful, developing 3.5kW (5bhp) more than its previous incarnation, thanks to its having larger SU carburettors. There was also a Le Mans-type head available, which developed 75kW (100bhp).
Another significant development that came with the release of the TR3 was the fitting of Girling disc brakes on the front wheels, which made the TR3 the first British production car to boast this feature.
As word got round of the TR3s improved performance, sales of the car began to rapidly emulate that of the TR2, driven by the United States market that had finally started to pay attention to the small but vigorous British sports car.
There is little doubt that it was the TR3A which established Triumph in North America, where most sales were made, as well as paving the way for the arrival of Spitfires and newer TRs during the swinging Sixties.
This model was known as the TR3A and continued in production until 1962.
In 1959 Triumph began to offer the TR3 with the option of a 2,138 cc engine, in response to tremendous interest generated after the car had come out first in the challenging Alpine Rally of the previous year.