The Triumph SD2 was a prototype vehicle built by British Leyland in 1975. The SD2 nearly replaced the Dolomite in and a saloon version would have replaced the Morris Marina but British Leyland cancelled it at the last moment.

The SD2 was to also be the natural successor to the Rover SD1. The designed team was led by David Bache whose task it was to design a car that the BL bosses would see fit to sell.

The most notable feature on the SD2 is its front-end styling treatment which gave the car a sleek modern appearance, and the treatment of the front wheel arches and bumpers was especially neat.

The SD2 was let down by its rear styling, where the semi-concealed rear wheels and rather heavy plastic appliqué aft of the rear side windows jarred with the rest of the car.

As the project progressed, it ran into increasing financial difficulties. First of all, the engine range was revised so that the O-Series engine in 1.7 and 2-litre forms could be used, in order to bring the SD2 in line with the Austin-Morris cars of the time. The 16-valve version would continue as being sold at the top of the range, but only to be built in relatively small numbers. Other problems concerned the cost of the gearbox/axle assemblies and whether they could be shared with the ADO77 project that was being drawn up at the same time in Longbridge.

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Triumph vehicles
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