1978 Trans-Am Series

The 1978 Trans-Am Series was the thirteenth running of the Sports Car Club of America's premier series. It was the first time the series left North America (i.e. the United States and Canada), with a round in Mexico at the end of the season. All races except for the Six Hours of Watkins Glen ran for approximately one hundred miles.

Results
‡ The Watkins Glen 6 Hours was a round of the World Championship for Makes, the overall winner was an FIA Group 5 Porsche 935

Category I

 * 1) Bob Tullius – 189 points
 * 2) Babe Headley – 98.5 points
 * 3) Frank Joyce – 72 points
 * 4) Brian Fuerstenau – 45 points
 * 5) John Huber – 44.5 points

Category II

 * 1) Greg Pickett – 132.5 points
 * 2) Tuck Thomas – 114.5 points
 * 3) Ludwig Heimrath – 102 points
 * 4) Hal Shaw, Jr. – 73 points
 * 5) Monte Sheldon – 71 points

Category I (Over 2.5L)

 * 1) Jaguar – 73 points
 * 2) Chevrolet – 69 points
 * 3) Datsun – 3 points

Category II (Over 2.5L)

 * 1) Chevrolet – 74 points
 * 2) Porsche – 65 points
 * 3) Pontiac – 10 points

Combined (Under 2.5L)

 * 1) Porsche – 72 points
 * 2) Datsun – 19 points
 * 3) British Leyland – 18 points
 * 4) Mazda – 18 points
 * 5) Opel – 12 points