The&nbsp;Triumph TR4&nbsp;is a sports car produced by the&nbsp;<a data-tabindex-counter="1" data-tabindex-value="none" href="https://en.wikipedia.org/wiki/Triumph_Motor_Company" tabindex="-1" title="Triumph Motor Company">Triumph Motor Company</a>&nbsp;from 1961 to 1965. Code named "Zest" during development, it was the successor to the&nbsp;<a data-tabindex-counter="1" data-tabindex-value="none" href="https://en.wikipedia.org/wiki/Triumph_TR3#TR3A" tabindex="-1" title="Triumph TR3">TR3A</a>. The car was based on the chassis and drivetrain of the previous TR sports cars, but with a modern body designed by&nbsp;<a data-tabindex-counter="1" data-tabindex-value="none" href="https://en.wikipedia.org/wiki/Giovanni_Michelotti" tabindex="-1" title="Giovanni Michelotti">Michelotti</a>. As 40,253 cars were built during its production years it proved to be very successful. 