The bodywork closely resembled that of the previous models, the TR4 & TR5, but the front and back ends were squared off. This is sometimes referred to as a Kamm tail. The construction was fundamentally old-fashioned: the body was bolted onto a frame instead of the two being integrated into a unibody structure.

All TR6 sports cars featured inline six-cylinder engines. For the US market the engine was carbureted giving out 104 hp. Other world markets got the Lucas fuel-injected engine producing 150 bhp.

The TR6 featured a four-speed manual transmission. An optional overdrive unit was a desirable feature because it enabled aggressive driving and provided "long legs" for open motorways. TR6 also featured semi-trailing arm independent rear suspension, rack and pinion steering, 15-inch wheels and tires, pile carpet on floors and trunk, bucket seats and a full complement of instrumentation. Braking was accomplished by disc brakes at the front and drum brakes at the rear. A factory steel hardtop was optional. The TR6 dashboard was wooden (plywood with veneer). Other factory options included a rear anti-roll bar and a limited slip differential.