The 1965 GT350 was not built for comfort or ease of driving. There were 34 "GT350R" race-spec cars built specifically for competition use under SCCA rules, and the model was the B-Production champion for three straight years. The 1966 GT350 was more comfortable for casual drivers, including rear seats, optional colors, and an optional automatic transmission. This trend for more options and luxuries continued in the following years, with the cars becoming progressively larger, heavier, and more comfortable, while losing much of their competitiveness in the process. The 1969 GT350s and GT500s were largely styling modifications to a stock Mustang. By 1969 Carroll Shelby was no longer involved in the Shelby GT program, and the design was done in-house by Ford.