The fifth year for the Shelby Mustangs and also the beginning of the end. The Ford Mustang got a new body in 1969. Ford was taking Trans-Am racing seriously and needed a more aerodynamic body style for the Mustang. Shelby American took that body style and created a very unique Mustang. The small block GT 350 engine was powered by the Windsor 351. The big block GT 500 had the Ford 428 under the hood. A convertible was also offered with either engine.