Triumph TR7 and TR8 (1975 to 1981)

Why people buy one

• It is the most numerous TR, so there are plenty to choose from.
• The convertible, sold in the UK from 1980, is the most popular version today.
• Later Canley and Solihull cars have a five-speed gearbox and stronger rear axle, which suit modern roads.
• The wedge styling is now regarded as a period design statement rather than a joke.
• Owners' clubs dedicated to the car hold factory records knowledge, including VIN decoding.

What to weigh up

• Build quality was poor in period, particularly at Speke, and many cars have had decades of patch repairs.
• The factory TR8 was sold mainly in North America in left-hand drive. Only around 18 UK-specification right-hand drive TR8s are thought to have been built.
• Hundreds of TR7s have been converted to V8 power. These can be good cars, but should not be described or bid on as TR8s.
• A genuine TR8 has a "V" (3.5 litre V8) as the engine code in its VIN. About 150 factory TR7 V8 coupés were also built in 1977, mostly for North America, so ask a club to check any claimed factory V8.
• The four-speed gearbox and early rear axle on Speke cars are weaker, and some parts for them are scarce.
• Early cord interior trim is hard to find.

Where they rust

• Sills, especially where they run behind the front wings. Look for cover sills welded over old metal.
• Floor to sill joints and footwells.
• Front strut tops.
• Boot floor and spare wheel well.
• Seam along the top of the rear wings, and the inner arches.
• Joint between sill and rear wing.
• Windscreen surround, which can let water into the car.
• Bonnet edges.
• Stress cracks in the rear bulkhead where the trailing arms mount.

Mechanical weak spots

• 2.0 litre engine: the alloy head can warp on the iron block, leading to head gasket failure. Look for oil and water mixing.
• Head studs can corrode into the head, which makes removal difficult.
• Timing chain: the factory recommended renewal every 25,000 miles, and a noisy chain is common.
• Fuel tank: water gets in around the filler and rusts the tank, which needs the rear axle lowered to replace.
• Gearbox and axle: the four-speed box and early axle are weak points. Five-speed axles are often louder.
• Suspension: worn bushes cause clonks, and worn trailing arm bushes or propshaft joints cause a clunk under load.
• TR8 V8: robust gearbox, but check for camshaft and follower wear and a stretched timing chain.

At a Mathewsons viewing

• Check the VIN plate and V5C match. The VIN shows body style, market, steering and engine type, and should be checked with a club if the car is sold as a TR8.
• Check the VIN prefix for the factory: Speke and Solihull prefixes begin with "A" and Canley with "T", and on Solihull cars the last letter of the prefix is "A". Bonnet badges are easily swapped, so do not rely on them.
• Lift the carpets and boot floor covering and use a torch on the footwells, sills and spare wheel well.
• Open the bonnet and look at the strut tops, the head gasket area for oil and coolant weeps, and under the oil filler cap for milky residue.
• On convertibles, check the hood fabric and the carpets for damp. If staff start the car, listen for timing chain rattle.

Parts, specialists and clubs

Seen on Bangers & Cash

• Triumph TR7 V8 (Bangers & Cash series 2, episode 6, First shown March 2020)
• Triumph TR7 convertible (Bangers & Cash series 6, episode 5, First shown September 2022)
• 1977 TR7 (Bangers & Cash series 9, episode 13, First shown May 2024)
• Triumph TR8 (Bangers & Cash series 11, episode 10, First shown March 2025)
• Triumph TR7 Special Edition (Bangers & Cash series 13, episode 3, First shown February 2026)

Sources

• Triumph TR7 buyer's guide (Classics World), 1 September 2022
• Buying guide: Triumph TR7 (Hagerty UK), 24 November 2021
• A Brief History of the TR8 (TR Drivers Club), accessed 13 October 2026
• TR7 and TR8 VIN Numbers Explained (Triumph Wedge Owners), accessed 13 October 2026
• History of the TR Drivers Club, accessed 13 October 2026