Primarily based in the United States, the series competes on a variety of track types including road courses and street circuits.

The Trans-Am Series was created in 1966 by Sports Car Club of America (SCCA) President John Bishop.

Since 2015, Trans Am has been a national series (Continental U.S. only), racing at tracks primarily throughout the East Coast, South, and Midwest.

There are now 12 race venues on the Trans Am Championship Series schedule (8 permanent road courses / 3 temporary road courses / 1 temporary street circuit), with the Chevrolet Detroit Grand Prix presented by Lear race[8] being open to TA2 class cars only.

The Chevrolet Detroit Grand Prix presented by Lear moves from early June to May 31—June 2, just four days after the event at Lime Rock Park ends.

On the 2019 West Coast Championship schedule, the season is one race longer (6), and opens a couple of weeks earlier at Willows, California's Thunderhill Raceway Park.

For 2020, the season finale at Daytona was dropped due to unresolvable scheduling conflicts, and after a two-year absence, the race at Brainerd, Minnesota was reinstated to honor the late Jed Copham, the track's co-owner and part time Trans Am Series driver.

The season's grand finale in both series will now be the shared event at Circuit Of The Americas (CoTA), with that race being moved from October to November.

The rounds at Watkins Glen and Lime Rock Park were the final casualties of the outbreak with late cancellations leading to double headers at Virginia International Raceway and Road Atlanta.

Trans-Am will also be having its first ever race at the newly renovated Charlotte Motor Speedway Roval and a TA2-only round at the inaugural running of the Music City Grand Prix on the streets of Nashville.

For the first time in series history, Trans-Am instituted a drop-round system where competitors can choose to drop their two worst round results including non-appearances that took place before August 1.

Power comes from overhead valve (two per cylinder), pushrod, naturally aspirated, carbureted (single 4-barrel) 366 cubic inch (5.99 L) V8 engines producing 850+ horsepower.

The costs of shock absorbers, brake calipers & pads, and wheels are controlled, and no titanium or carbon fiber components are allowed.

TA2 is currently Trans Am's most popular class among competitors and has been exported internationally to Europe, Asia and Australia.

All original period-correct GT3 specifications will be enforced, and the series intends for 2016 and earlier cars that have had expired homologations to participate.

Unlike GT class cars, the current rules allow them to compete at a higher level of vehicle preparation.

[14] SGT class cars must be of a number of different specified domestic or foreign makes, models, and year of manufacture, from American "muscle cars", such as Chevy Corvettes and Camaros, Dodge Challengers and Vipers, and Ford Mustangs to European exotics like Aston Martins, Ferraris, Ginettas, Ligiers, McLarens, Mercedes-AMGs, Lamborghinis, Maseratis, Panozes, and Porsches, as well as Asian exotics, such as Acura NSXs.

"All vehicles must be production based, whether mass-production or limited-production, or a "kit car" that matches the look and performance of the GT class, and is available to the general public" (including 'track specific' models),[15] such as Ford Mustangs, Chevrolet Camaros, Dodge Vipers, Nissan 350Zs, Porsche Caymans, or Mercedes-AMGs, and many more.

The class is intended to be a competition between late model, nearly stock, high-performance cars, and as the introductory level for Trans Am Series beginners to start racing.

Originally, Manufacturers' Championship points were awarded in all classes to the top 6 finishing positions of each make of car: 9-6-4-3-2-1.

Final point standings ties will be decided by which manufacturer has more wins, second-place finishes, etc., as necessary to determine the winner.

Points earned at shared events only count toward the series that the driver / team is currently entered in.

Series Champions are awarded the brand new for 2017 Trigon Trophy (sponsored by 3-Dimensional Services Group, and custom designed by longtime partner Crystal Sensations).

There are very specific requirements for entry into the regional championships, as they are intended to allow drivers to try competing in the series before committing to running the full schedule of events.

The number of points earned follows the same methodology as in the Driver's Championship (according to finishing position), but as the rule book states, "In addition to the points earned on-track, teams will be judged by several factors that embody a professional team and help promote, and improve, the Series".

For the 2021 season, the Trans Am Series in partnership with the Sports Car Club of America created the Pro/Am Challenge.

Alfa Romeo[19] Alfa Romeo[23] American Motors Datsun[24][25] American Motors George Follmer John Morton Chuck Cassaro David C. Seuss Ernie Francis Jr. Jason Berkeley Ernie Francis Jr. Lee Saunders NOTE: In 1980, the Sports Car Club of America retroactively named an overall drivers' championships for all pre-1972 seasons, using the points system of the time to calculate drivers' championships.