The Blazer had several advantages over its competitors. It was not so short, it retained the full width of the truck it was based on giving room for four passengers and their luggage, and not least of all it was a Chevrolet with the time-tested small-block V8 engine. It outsold all of its immediate competitors. In 1973 it was restyled and featured the most significant innovation for more than 30 years, full-time 4-wheel drive. A padded roll bar was introduced in 1974. About 83% of vehicles were built with automatic gearboxes. In 1979 it acquired a catalytic converter and a single exhaust pipe. This is a compilation of road and comparison tests, technical and specification data, owners" survey, and suspension modifications. Models include:- 350, 307, Safari, 400, Chalet, soft-top, Jimmys, 383, 400, Cheyenne.