The 1955-'57 Chevy Tri Five was a hugely successful line, and to this day remains one of the greatest icons of classic American car culture. But there was a catch for General Motors. As is often the case with this degree of success, consumers' expectations were high and the Tri Five would be a tough act to follow. Knowing this, GM designers and engineers put a lot of work into its successor, the 1958 Full Size Chevy line.