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The Triumph Spitfire ... The Herald's rack and pinion steering and coil-and-wishbone front suspension ... was the first major facelift to the Spitfire. The front ...
The steering column is also sourced from the Triumph. [2] The rear suspension is based on trailing arms fabricated by Aerocon, with Girling coil springs over telescopic shock absorbers. [2] The braking system is a combination of Spitfire front discs and VW rear drums. Adapter plates on the front hubs match the front bolt pattern to the rear. [2]
The Vitesse was also modified, but the Spitfire had to wait until 1971's Mk IV for any improvements to be made. There were other changes for the Mk II; the front bumper was raised (in common with the Spitfire Mk 3) to conform to new crash regulations, necessitating a revised front end, and side vents were added to the front wings and rear pillars.
At the front coil and double-wishbone front suspension was fitted which was in time directly copied by such as Lotus, the Bill Thomas Cheetah and Reliant. The rear suspension, in a new departure for Triumph, offered "limited" independent springing via a single transverse leaf-spring bolted to the top of the final drive unit and swing axles.
The TR4A's rear suspension is a semi-trailing arm system with coil springs and lever-arm shocks. It more closely resembles that of the Triumph 2000 than the swing axle systems used in the Herald or Spitfire. The chassis was redesigned to accommodate the new suspension, with extensive changes to the side members and cross-bracing.
In 1963 the car received a larger version of the SC engine from the Triumph Spitfire and front disc brakes came from the same source in 1966. A hardtop was available as an option. With various specification changes the cars went from a Mark I to a Mark VI which had a Triumph GT6 chassis. [4]