The Triumph TR6 was the best-seller of the TR range when production ended, a record subsequently surpassed by the TR7.
The bodywork was generally similar to the TR4/TR5, but with the front and back ends squared off.
All TR6s were powered by Triumph's 2.5-litre straight-6, with the same Lucas mechanical fuel-injection as the TR5 for the United Kingdom and global markets, and carburetted for the United States, as had been the US-only TR250. The TR6PI (petrol-injection) system helped the home-market TR6 produce 150 bhp at model introduction.
The TR6 featured a four-speed manual transmission. An optional electrically switched overdrive operated on second, third, and fourth gears on early models and third and fourth on later ones.
Construction was traditional frame. Other features included semi-trailing arm independent rear suspension, rack and pinion steering, 15-inch (380 mm) wheels and tyres, pile carpet on floors and trunk/boot, bucket seats, and full instrumentation. Brakes were discs at the front and drums at the rear. A factory steel hardtop was optional, requiring two people to deploy. The dashboard was walnut veneer. Other factory options included a rear anti-roll bar and a limited-slip differential.