The T73 was driven by Bruce McLaren and Phil Hill in 1964, debuting at the Monaco Grand Prix.

McLaren's car broke a wishbone in practice and he drove the previous year's T66 in the race, while Phil Hill retired with suspension failure.

Hill had an even worse season, scoring a solitary one point and managing to crash both his T73 and the spare T66 in Austria, resulting in his temporary sacking by John Cooper, which resulted in him sitting out the Italian Grand Prix, replaced by John Love.

Pearce Engineering who fitted it with a Ferrari GTO 3-litre V12 and entered it in several races in 1966 and 1967 for Chris Lawrence.

It was not particularly successful although it A derivative hybrid version, called the T71/73, was a mix between the T73 and the Formula 2 T71 chassis, powered by a 1.5 litre Ford Twin-Cam engine and built by Bob Gerard Racing and entered in the British Grand Prix in 1964 and 1965.