The Triumph GT6 received new styling for the 1971 model year and became known as the Mark III. It was given smoother bumpers, recessed door handles, rear quarter windows that extended farther towards the rear, changes to the rear profile, and slightly flared wheel openings. The four-speed manual gearbox was available with optional overdrive. The button for the overdrive, which had been a switch on the dashboard, was no on the gearshift lever.

Tougher restrictions on safety led to a decrease in horsepower during the 1970s. The GT3 MKIII came with an overhead-valve six-cylinder engine displacing 1998cc and offering nearly 80 horsepower. Torque was rated at just under 100 lbs-ft. Disc brakes were in the front with drums in the rear.

Production of the MK3 GT3 lasted from 1971 to 1973 with approximately 13,042 examples produced.
By Daniel Vaughan | Dec 2011
The Triumph GT6 was produced from 1966 through 1973. The GT6 followed on the heals of the Spitfire sports car. The body was a fastback with the rear hatch being able to open. The vehicle came from company as a two-seater but if requested additional seating could be place into the rear but it could only accommodate a small child. Under the long, building hood was a straight six-cylinder that produced just under 100 horsepower. A four-speed manual was standard; overdrive was offered as optional equipment. Top speed was around 106 mph with zero-to-sixty taking about 11.7 seconds. Fuel economy was respectable. The vehicles largest downfall was its poor handling in corners. Drivers reported the car had a tendency to break away, much like other models in the Triumph line-up. The extra weight of the vehicle made the Triumph GT6 even worse and magazines and press criticized the car rather heavily.

The interior was rather elegant with a wood dash and complete instrumentation. Heaters and carpets were a luxury at the time and Triumph offered it as standard equipment.

In 1968 Triumph introduced the GT6 MK2, also known as the GT6+. The spring suspension was replaced with a swing-axle unit with rotoflex couplings resulting in a revised reputation for Triumph. Triumph had finally found a reasonable solution to their Achilles-heal.

As government regulations and safety concerns continued to mount, Triumph conformed to these requirements by raising the bumper. The front end required a little modification due to the bumper changes. Side vents were added to the front wings and rear pillars.

Triumph modified the engine with a new cylinder head, manifolds and camshafts which boosted horsepower to 104. Top speed was now about 117 mph with zero-to-sixty taking about 10 seconds. This was faster than its competitor, the MGB GT which had a 105 mph top speed and 13 second zero-to-sixty run. On the interior a two-speed heater fan was now standard. The dash also received modifications.

The Triumph GT6 MK3 was the final upgrade for the GT6 series; it was introduced in 1970 and lasted until 1973. Triumph revised the body which brought it inline with the design of the Spitfire. Just before the vehicle was discontinued, the suspension was again revised this time with a swing-spring setup. 1973 brought about other changes such as cloth seats, replacing the previous vinyl. Servo brakes were also added.

The Triumph GT6 was a great sports car but it never achieved the sales success the company had hoped. The handling was a problem during its early life but these were quickly rectified. Some have speculated that a convertible option would have helped boost sales.
By Daniel Vaughan | Sep 2006
The 1963 Triumph decided to enhance their range of vehicles this was accomplished by introducing the GT6.

The GT6 MK3 was introduced in November of 1970. Keeping in line with the Spitfire MkIV, the bonnet was flattened out and the tail was also ‘chopped off'. No longer protruding, the petrol cap and door handles were adjusted, and the rear roof line of the GT6 was altered. To meet U.S. emission regulations in 1972, the Triumph US specification vehicles updated their carburetor, ignition, piston, distributor and camshaft design. This reduced the vehicle power to 95 bhp.

The following year the GT6 received a facelift that included the addition of new fabric upholstery and new style instruments. The European vehicles received servo assisted brakes and ‘sundym' glass.

The power output was reduced even lower to 79 bhp as the US specification cars emission control was further controlled. This forced the GT6 MK3 to not be as competitive as previously due to the extra cost on the vehicle. The advance rear suspension was converted back to the old swing axle type in an attempt to keep the car comparable with its closest rival, the MGBGT.

Unfortunately the safety legislation that was enforced by the US market meant a considerable increase in weight, and sales declined steadily. The exhaust emissions badly affected the power of the six-cylinder engine.

The last two GT6s left the factory on November 30, 1973.

By Jessica Donaldson
 
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