|Category||Sports car racing|
The Trans-Am Series is an automobile racing series held in North America.
- 1 Origin
- 2 Current Series Format
- 2.1 Tires / Presenting Sponsor
- 2.2 Schedules
- 2.3 Car Classifications
- 2.4 Event Protocol
- 2.5 Championships / Awards
- 3 Manufacturers / Drivers Championships
- 4 Class Championships by manufacturer
- 5 Tributes
- 6 See also
- 7 Other series based on the Trans-Am Series model
- 8 References
The Trans-Am Series was created in 1966 by Sports Car Club of America (SCCA) President John Bishop. Originally known as the Trans-American Sedan Championship, the name was changed to the Trans-American Championship for 1967 and henceforth. The series has in fact gone by a variety of different names through the years (too many to list), some linked to sponsors, some not. It has evolved over time from its original format as a Manufacturers' Championship series for modified passenger sedans and Coupés to its current form as a Drivers' / Manufacturers' Championship Series that is open to GT style racecars. Champion drivers have been officially recognized, and Drivers' Championships awarded since the 1972 season.
Over the years, the series has raced on a variety of different types of race tracks (Permanent and temporary road courses / street circuits / airport circuits) all over the country, as well as at venues in Canada, Mexico, and even San Juan, Puerto Rico in 2003. Since 2015, Trans Am has been a national series (Continental U.S. only), racing at tracks primarily throughout the East Coast, South, and Midwest. In 2017, the new stand-alone West Coast Championship was added to the Trans Am Series. Currently, there are six races on the schedule, two of which are joint, or "shared" races with the national Championship series, in which drivers from both championship series race together in the same races, but only earn points in the championship series that they are entered in.
Current Series Format
Tires / Presenting Sponsor
In 2017, Pirelli became the exclusive tire supplier (replacing Hoosier Racing Tire) and presenting sponsor for the Trans Am Series, and all classes use Pirelli P ZERO radial ply racing slicks. The change from bias ply tires to Pirelli P ZERO radial tires has been very well received, and has resulted in faster average speeds and improved lap times in all four classes.
In late 2016, the Trans Am Race Company (TARC) announced that after a long absence, the Trans Am Series would return to the West Coast with the 2017 Trans Am West Coast Championship, partnering with the Sportscar Vintage Racing Association (SVRA). The West Coast Championship Series consists of a separate 3 race competition, plus one round that is shared with the Trans Am Championship Series at Circuit of the Americas. (3 permanent road courses / 1 temporary road course)
For 2017, the schedule was reorganized, with five race venues (Homestead-Miami Speedway, Road Atlanta, Watkins Glen, Virginia International Raceway, and New Jersey Motorsports Park) receiving new dates, the Indianapolis Motor Speedway being added, and Louisiana's NOLA Motorsports Park being dropped.
For 2018, the Brainerd, MN and New Jersey Motorsports Park races were dropped, and a race at the Pittsburgh International Race Complex was added for the TA, TA3, and TA4 classes only. 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 being open to TA2 class cars only. There are actually 13 actual races on the schedule, as the TA2 cars race twice in Detroit.
For 2018, the West Coast Championship's race at Willow Springs, CA was dropped, Sonoma, CA was added, and a shared race at INDY was added, expanding their series to a separate 3 round competition, plus two shared races (3 permanent road courses / 2 temporary road courses).
The schedule for 2019 continues to be 12 races long (including two "shared events" with the West Coast Championship Series), but the mid-April Homestead, Florida race date changes to an early May event at Weathertech Raceway, Laguna Seca, California -- the first time the series has raced there since 2004. The early August Pittsburgh race was also dropped, having been replaced by the Memorial Day Motorsports Festival at Connecticut's Lime Rock Park, the first time the series will have raced there in three years, and it will be the thirtieth time overall. Additionally, the Indianapolis race weekend moves from mid-June to early August, and the "shared" Circuit of the Americas (COTA) race weekend moves from early November back to early October. The Chevrolet Detroit Grand Prix presented by Lear moves from early June to May 31st -- June 2nd, just four days after the event at Lime Rock Park ends. The season finale at Daytona International Speedway moves up one week to mid-November.
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. The shared event at Laguna Seca takes place in early May, with Sonoma moving from early June to mid-June, replacing the shared event at the Indianapolis Motor Speedway. The shared event at Circuit of the Americas (COTA) moves from early November to early October.
Tube-Frame / Silhouette Body
TA class cars are high-performance Grand Touring race cars with a tubular chassis and a Cadillac CTS-V, Chevrolet Camaro / Corvette, Dodge Challenger, or Ford Mustang body (full-scale replica) built by Advanced Composite Products (all eligible cars except Corvette C7) or Derhaag Motorsports (Corvette C6, C7 / Camaro Gen 6 only). All body types are eligible from the first year of production of the street car to 5 years after production ends. After each body model's full eligibility ends, each body will be partially eligible for an additional 5 years, and may be used in up to five races per year of eligibility.
Power comes from overhead valve (two per cylinder), pushrod, naturally aspirated, carbureted 366 cubic inch (5.99 L) V8 engines producing 850+ horsepower. The minimum base weight is 2,850 pounds (see rulebook for specifics). Current rules allow for the use of leaded gasoline, whereas all other classes must use unleaded gas. The use of Nitrous Oxide (or other similar compounds or systems), fuel additives, and/or fuel cooling, as well as supercharging or turbocharging is strictly prohibited in all classes. Automatic transmissions are also prohibited, and manual transmissions must have no more than five forward gear ratios, as well as a functional reverse gear. Sequential shifting transmissions are permitted, as well as commercially available No-Lift Shift (NLS) systems, and also "auto-blip" RPM matching systems for downshifting. Traction Control devices or systems that function independently of the driver are strictly prohibited, as is ABS (Anti-skid Braking System).
TA2 class rules specify a tubular chassis built by Howe Racing Enterprises, Mike Cope Racing, M-1 Motorsports, or Meissen Enterprises, and a Chevrolet Camaro, Ford Mustang or Dodge Challenger body (full-scale replica) built by either Five Star Racing Race Car Bodies (Gen 6 Camaros / Mustangs), or Howe Racing Enterprises (all other eligible cars), with the Camaro body being the most popular by far. (See current rule book for body eligibility, as it varies according to model and 'Generation') Specific to the TA2 class, two functional brake lights in their approximate stock locations are required, and one must be functional any time the car is on track. Likewise, two functional taillights/rain lights are also required. The minimum base weight (including driver and any driver gear) for all cars is 2,830 pounds. The costs of shock absorbers, brake calipers & pads, and wheels are controlled, and no titanium or carbon fiber components are allowed. Only the driver's seat and rear wing may be constructed using carbon fiber. TA2 is currently Trans-Am's most popular class among competitors.
TA2 engines are similar to TA engines, but they use fuel injection rather than a carburetor. They must use intake restrictor plates, as maximum power is limited to 490 HP and 447 lb-ft of torque. The use of Nitrous Oxide (or other similar compounds or systems), fuel additives, and/or fuel cooling, as well as supercharging or turbocharging is strictly prohibited in all classes. As per current rules, "Nothing may direct or force air to the filter or housing." Transmissions must be commercially available, 'H pattern' manual units with four forward gear ratios (1:1 fourth gear ratio, and no overdrive) and a reverse gear. Sequential shift mechanisms are not allowed, nor are shift-without-lift mechanisms. Traction Control devices or systems that function independently of the driver are strictly prohibited, as is ABS (Anti-skid Braking System).
SGT (Super Grand Touring – formerly TA3)
The production based 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, such as Aston Martins, Audis, BMWs, Ferraris, Ginettas, McClarens, Mercedes AMGs, Lamborghinis, Maseratis, Panozes, and Porsches. (See current rule book for complete listing of all eligible makes and models) As stated in the current rule book, The "...class is intended for recent model sports cars and new option engine Camaros and Mustangs." But "Additional cars having similar performance capabilities and fitting in with the overall concept of the class will be considered for inclusion in the SGT class". Eligible cars up to 15 years old will now be able to race in the series, and for 5 years after that – partially eligible cars will be able to race in up to 6 races per year of eligibility. Unlike GT class cars, the current rules allow them to "...compete at a higher level of preparation." Standard body appearance must be maintained, including the OEM grille and badge. As with GT, Tube frames are not allowed, and roll cages are mandatory. Some engines are required to have restrictor plates, for the purpose of equalizing performance. Minimum Vehicle Base Weights may be changed for the same purpose. The use of Nitrous Oxide (or other similar compounds or systems), fuel additives, and/or fuel cooling, as well as supercharging or turbocharging is strictly prohibited in all classes.
GT (Grand Touring – formerly TA4)
This class complies more with the "classic" Trans Am standards of the glory era. GT class cars must be a modern production-based Ford Mustang, Chevrolet Camaro, Dodge Challenger, Ferrari 360 Challenge and GT, Ferrari 430 Challenge, Maserati Grand Turismo MC Trofeo/GT4, Porsche Cayman X51 Gen 2&3, Cayman GT4 Club Sport Gen 3, 2009 - 2013 Aston Martin Vantage GT4 Gen 1&2, Ginetta G55, McLaren 570-S, or Mercedes AMG. (See current rule book for complete listing of eligible makes and models) Like the SGT class, there is a 15 year period of full eligibility, and a 5 year period of partial eligibility for eligible makes and models. The class is intended to be a competition between late model, nearly stock, high-performance cars. It's an affordable class, and a good place for Trans Am Series beginners to start racing in. As with SGT, some engines are required to have restrictor plates, for the purpose of equalizing performance. Minimum Vehicle Base Weights are adjusted depending on optional components used. The use of Nitrous Oxide (or other similar compounds or systems), fuel additives, and/or fuel cooling, as well as supercharging or turbocharging is strictly prohibited in all classes.
- Direction of Travel
In the Trans Am Series, the direction of travel on the racetrack is up to each race facility. It is usually "clockwise" (right to left, as viewed from outside the track), except at Circuit of the Americas, WeatherTech Raceway Laguna Seca and Daytona International Speedway. In the West Coast Championship series, the direction of travel is clockwise at all tracks other than Auto Club Speedway and Circuit of the Americas.
- Sound Limit
As stated in the 2019 Rule Book, "All vehicles must meet the sound requirements of 115 dBA, or less. Certain tracks may have lower sound limits. If so, and if the series is unable to obtain a waiver, the lower sound limit will be published in the supplemental regulations. Cars exceeding the sound limit on-track will be black flagged and not allowed to continue competing until the sound generated by that car is brought within spec."
- Exterior Lighting
A minimum of one fully functional rear brake light, and also at least one fully functional tail/rain lights in its/their approximate (TA2 only, all others: stock location) stock location(s) is required on all cars competing in the Trans Am Series. They must be plainly visible and unobscured, and brake lights must function just as they would on a production car. Output may be greater than stock. As stated in the rule book, the rain/tail lights must be used during rain/fog sessions, and/or during twilight sessions, and any time the track is wet enough to produce spray. Their output may be greater than stock, but not so bright as to be confused with brake lights.
Operable headlight assemblies are recommended for all cars competing in any class, but are only mandatory in the SGT and GT classes. A minimum of one fully functional headlight must be used during rain/fog/spray/twilight sessions. The lenses may be clear or yellow tinted. An operational low and high beam is recommended, and output may be greater than stock.
- Testing / Practice / Qualifying / Tire Marking / Race Length
Prior to each race, there are two test sessions, one practice session, and at least one qualifying session. As per the current Trans Am rule book, "All cars must compete on Pirelli tires as listed in the current year Trans Am Tire Fitment List." Each car has four dry tires per car marked by the Trans Am Technical Staff prior to qualifying. "All cars shall start the race on the same set of marked dry tires that they qualified on, or on the set of dry tires the team had marked prior to qualifying if rain tires were used in the qualifying session." Treating / modifying tires in any way, or warming them is strictly prohibited. Scraping off rubber buildup (clag) on the surface of any tires is permitted.
Since the 1975 season, Trans Am races are ~100 miles in length, but not less. As stated in the current Rule Book, "The normal race length of Trans Am Championship, Presented by Pirelli Races is 100 miles (including the lap that completes the 100 mile length) unless otherwise specified in the Supplemental Regulations or otherwise changed by the CHIEF STEWARD during the course of the event weekend". "As directed by the CHIEF STEWARD, the SERIES TIMEKEEPER will keep the official time and distance and will announce whether the race will be a time, or distance, competition, along with the laps remaining." "The CHIEF STEWARD may designate a maximum length of time in which the race must be completed (e.g. 20 laps/60 miles, or 45 minutes, whichever comes first). Regardless of the race format, finishers will be determined by the total number of laps completed, and who finished them first."
- Fuel / Pit Stops / Tire changes / Rain Procedure
Trans Am Series racecars carry enough fuel to run the entire race non-stop, making each race a 100 mile sprint that is a test of driver skill and competitiveness. Current rules allow for TA class cars to use leaded (112 Octane) or unleaded (100 Octane) gasoline. All other classes must use unleaded gas. (All fuel is supplied exclusively by Sunoco Race Fuels) Fuel containers and/or refueling on pit lane, or the grid is strictly prohibited. Fueling / refueling is only permitted in the team's paddock space.
Pit stops are neither needed nor required, other than for the purpose of changing over to rain tires, or for some other mechanical or other issue. The pit lane speed limit is 45 miles per hour during testing / practice / qualifying / race sessions.
Teams are only allowed to change one dry tire, any time after qualifying begins, without penalty. Once the race has started, any number of tires may be changed. Changing over to (or from) rain tires is up to each driver / team, and is not limited.
All Trans Am by Pirelli races go on even if it rains or has rained, and all cars must be able to race safely during wet sessions. Depending on conditions, drivers may choose to pit and change over to softer, treaded rain tires. If conditions change from dry to wet after the race has started, the Safety Car may be dispatched in order for Race Control to determine what actions may be necessary, or the Black Flag may be waved to allow all cars to enter the Pits and make any and all necessary changes in order to race under wet conditions. All cars will return to the track in the positions they were before the Black Flag, and the race will be restarted.
A minimum of one operational windshield wiper, and also a windshield defogging/demisting system (or anti-fog films) that can keep the windshield clear during wet sessions must be installed on all cars, and used when necessary. The wiper blade(s) and arm(s) may be removed for dry sessions.
- Multiple Class Race / Grid
TA, SGT, and GT class cars all "grid" (with the 2 fastest qualifiers on the front row, and all other slower cars behind them according to qualifying times) and race together during the same "race session" using a staggered start with the two slower classes starting their respective races (in order of class) behind the TA class grid, being separated from each other as well. The fastest qualifiers in each of the four classes may choose to start on the left or right of the next fastest qualifier on the front row. TA2 class cars have their own separate race.
- Race Start / Finish
The series uses a rolling start with the Pace Car setting the pace lap speed as it approaches the Starter at the Start / Finish line, who uses a green flag to signal the start of the race for all classes in a multi-class race (or the TA2 grid). Cars line up behind the Pace Car two abreast, with the fastest qualifier having his / her choice of left or right position. In the absence of a Pace Car for a multi-class race, the "Pole" car for each class will serve the same function as the Pace Car from its position in the front row. The front row for the next class must be approximately 500 feet behind the last car of the class in front (or as otherwise directed). If the green flag is not waved, and additional pace laps are required, those pace laps count toward the scheduled race distance / time.
At the completion of the last lap, the Starter waves a checkered flag, signifying the end of the race. All winning drivers, as well as second and third-place finishers (plus any award winners announced over the official race control frequency) are required to attend the Winner's Circle ceremonies at the victory podium/rostrum.
- Flags / Safety Car
The series uses race control flags (six 'advisory' / seven 'mandatory compliance'), which are waved at a number of "Flag Stations" around the track, to communicate with competitors during all qualifying, practice, and race sessions. The "Safety Car" may be dispatched for additional race control, and is always used to lead the field during all Double Yellow Flag periods. All restarts are single file.
The Advisory flags are GREEN (beginning or resumption of a session, and that the course is clear), BLACK AND WHITE DIVIDED DIAGONALLY (shown once only to the Driver with a number board from the Starter as a Warning for 'Unsportsmanlike Behavior'), BLUE WITH YELLOW DIAGONAL or SOLID BLUE (advisory for competitor following you), YELLOW WITH RED STRIPES (caution, the racing surface may be affected by fluids and/or debris), WHITE (caution, you are approaching a slow moving vehicle), and WHITE WAVED AT START/FINISH LINE (last lap of competition).
The Mandatory Compliance flags are BLACK (shown to the Driver with a number board from the Starter and/or at designated flag station(s) on the circuit. The Driver must report to Series Officials on pit lane for consultation and/or penalty within four (4) laps or face possible additional disciplinary actions), BLACK WITH ORANGE DISC IN CENTER (shown to the Driver with a number board from the Starter and/or at designated flag stations on the circuit to advise of a mechanical problem that may endanger the Driver or other competitors. Driver must report immediately to their assigned pit at reduced speed and may not rejoin the session until released by the Technical Director or his designate), YELLOW (local / partial course caution – must reduce speed and line up in single file – no passing), WAVED YELLOW (use great caution!), DOUBLE YELLOW (full course caution – no passing), RED (the session has been stopped – use caution and proceed immediately to pit lane – no passing), and BLACK AND WHITE CHECKERED (completion of practice, qualifying, or race).
In January 2018, the Trans Am Race Company, LLC (TARC) announced that it had "...reached an agreement with Audible Flagging Systems (AFS), now the Official Flagging System Provider of the Trans Am Series presented by Pirelli. AFS, the industry leader for in-car race flagging systems, will be installed in all Trans Am race cars to warn drivers of caution flags immediately and simultaneously. The system is proven to also minimize secondary collisions, which can be particularly dangerous and damaging."
"The onboard system not only flashes a brilliant yellow light inside the car but also emits an audible warning tone to alert competitors of caution conditions." The new in-car flagging system will be installed free of charge to all Trans Am Series competitors to keep the cost of racing in the series in check. Additionally, the new system is supplemental, and does not replace Race Control, driver spotters, or corner workers (flaggers).
Championships / Awards
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. Beginning in 1972, the SCCA instituted a Drivers' Championship that would be based on overall finishing position from 1st through 10th places: 20-15-12-10-8-6-4-3-2-1. Beginning in 1990, the top 25 finishers were awarded points as follows: 30-27-25-23-21-19-18-17-16-15-14-13-12-11-10-9-8-7-6-5-4-3-2-1-1.
Currently, Manufacturers' Championship points are earned in exactly the same manner as they were originally. (*Vehicles must be classified as finishers to score Manufacturers' points.) Final point standings ties will be decided by which manufacturer has more wins, second-place finishes, etc., as necessary to determine the winner.
Series Champions in each of the four competition classes are determined based on points accumulated during the season. Drivers' Championship points are awarded as follows: At each race, after Qualifying has been completed, 3 points are awarded to the First Qualifier, 2 to the Second Qualifier, and 1 to the Third Qualifier. The top 24 finishers in each class, at each race are awarded points as follows: 30-27-25-23-21-20-19-18-17-16-15-14-13-12-11-10-9-8-7-6-5-4-3-2. All other finishers are awarded 1 point, provided the driver is classified as a starter. During each race, 1 point is awarded to any driver leading a lap in class, as well as 1 point for leading the most laps in class for each race. "In the event qualifying was not held due to any reason, Drivers Championship points will not be awarded." (A driver must be classified as a starter to score Championship points.)
The West Coast Championship Series operates just like the national championship. Points earned at shared events only count toward the series that the driver/team is currently entered in. If a race counts toward more than one championship series, a driver wishing to earn points for more than one championship must formally enter each series.
2018 introduced the Northern Cup and Southern Cup Regional sub-championships for teams that either do not wish to, or cannot run the entire race schedule, and have run a limited number of races in the past. 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. A driver/team may earn points in one or both championship series, or either the Northern or Southern Cup sub-championships in each class, per season, but not both a sub-championship and one or both of the full schedule series.
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). According to The Trans Am Race Company, LLC President John Claggett, "The base is shaped as a “D”… The crystal is essentially 3 sided… thus… the Trigon Trophy reflects the sponsorship. And yes… They are beautiful." The Trans Am Series' traditional colors are red and black, and Pirelli's color is yellow, with The Trigon Trophies incorporating those design elements.
New for 2018 is the Trans Am Team Championship, with points being awarded to each car/car number. Multiple drivers may compete in the same car / car number in order to earn points towards the Team Championship. 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".
Also new for 2018 is the Master's Championship, which is intended to recognize drivers still actively competing on the racetrack who are over 65 years of age. Again, the points schedule for driver's championship points will be used. The highest finishing Master's Championship driver in each class will be recognized during the podium ceremony after each race. At the end of the year, the top three Master's Championship drivers in each regional series will be recognized at the series awards banquet.
Rookie of the Year winners in each class are also determined by points accumulated during the season.
After the results of each race are "final", the COOLSHIRT Systems "Cool Move of the Race" Award (If applicable, it is given to the outstanding driver of the race, and the "move" could also be a 'move up through the field'.), pitboxes.com Crew Award, and Traq Gear Crew Chief Award are given out.
*See current rule book for complete information on all Trans Am Series rules and regulations.
Manufacturers / Drivers Championships
West Coast Championship
|Year||Champion Manufacturer||Champion Driver||Car||Team / Sponsor|
|2017||Ford||TA: Greg Pickett||Ford Mustang||Pickett Racing|
|Chevrolet||TA2: Shane Lewis||Chevrolet Camaro||PuraVidaTequila/74RanchResort|
|Chevrolet||TA3: Oli Thordarson||Chevrolet Corvette||Alvaka Networks/Trackspec Motorsports|
|Maserati||TA4: Guy Dreier||Grand Turismo GT4||Guy Dreier Designs|
|2018||Chevrolet||TA: Tomy Drissi||Chevrolet Camaro||GoShare|
|Ford||TA2: Thomas Merrill||Ford Mustang||Big Diehl Racing|
|Chevrolet||TA3: Oli Thordarson||Chevrolet Corvette||Alvaka Networks/Trackspec Motorsports|
|Ford||TA4: Dane Jorgenson-Smith||Ford Mustang||Bob Smith Motors|
Class Championships by manufacturer
|Ford Motor Company||23|
|American Motors (AMC)||3|
- The "Historic Trans Am Series" is "...simply a group of individuals who wish to share our appreciation for the great race series -- the Trans Am -- during its heyday from 1966 to 1972." Original racecars from Trans-Am's "golden era" are faithfully restored to original condition, and then "raced" at select events. They are a regular group at historic automobile racing events. In 2010, the Monterey Historic Automobile Races at Mazda Raceway Laguna Seca in Monterey, California paid tribute to the under 2000cc group. On occasion, the Monterey Historics and its former sister event at Sonoma Raceway, also in California, have paid tribute to 1980s Trans-Am cars, often referring to them as "IMSA GTO" cars. In recent years, the Sonoma event has referred to them as "SCCA cars".
- A few teams in the Continental Tire Sports Car Challenge, which is reminiscent of the old Trans-Am Series, have painted their vehicles to resemble the old Trans-Am cars. In 2010 Multimatic Motorsports painted their Ford Mustangs to resemble those of Parnelli Jones and George Follmer. Also entered that year was a modern version of the Sunoco sponsored Chevrolet Camaro.
- The Pontiac Firebird Trans Am was named after the series. According to SCCA archives, that brand has taken 7 wins and 1 Championship in the 42 year old series' 450+ events. The last win by a Pontiac Firebird Trans Am was in 1984.
- Tommy Kendall previously drove a Dodge Challenger using tribute livery modeled after Sam Posey's 1970 Challenger.
- "The History of the Trans Am Series"(1966 – 1995) YouTube/Speedvision video
- History of the Trans Am Series 1966-1995 DVD
- List of Trans-Am Series marques
- Trans-Am production cars
Other series based on the Trans-Am Series model
The Trans-Am Series has used tube-frame / silhouette cars, similar to the original IMSA GT Series, since the early 1980s, with heavy emphasis on GT cars. The SCCA Pro Racing World Challenge and Continental Tire Sports Car Challenge racing series, run by the Sports Car Club of America (SCCA), and the International Motor Sports Association (IMSA), respectively, utilize modified production-based cars, sports cars, and touring cars, similar in spirit to the Trans-Am Series since the 1980s. With the rise of these other series, Trans-Am saw decreased attention from the media, however, Speedvision did occasionally cover Trans-Am races until the series' demise in 2006.
- Erickson, Keith (May 17, 2017). "Historic Trans Am History". Historic Trans Am. Archived from the original on 2011-10-05.
- Erickson, Keith (May 17, 2017). "Trans Am Championship". TheThirdTurn.com.
- Erickson, Keith. "Trans Am Championship". The Third Turn. Retrieved August 18, 2017.
- Erickson, Keith. "Pirelli Tires becomes official tire supplier". Speed Sport. Retrieved May 1, 2017.
- Erickson, Keith (July 12, 2017). "Pirelli named Official Tire, Presenting Sponsor of the Trans Am Series". Trans Am Series presented by Pirelli.
- Erickson, Keith. "Return of the Trans Am West Coast Championship". GoTransAm.com. Retrieved 2 May 2017.
- Erickson, Keith. "Trans Am ready for Motor City alongside 3-Dimensional Services". Trans Am Racing. Retrieved August 18, 2017.
- Erickson, Keith (May 17, 2017). "TA Class". GoTransAm.com.
- Erickson, Keith. "55-car Trans Am Series presented by Pirelli field descends on Road Atlanta". GoTransAm.com. Retrieved 11 May 2017.
- Erickson, Keith. "2017 Trans Am presented by Pirelli 2017 Rule Book" (PDF). gotransam.cdn.racersites.com. Retrieved May 2, 2017.
- Erickson, Keith (July 11, 2017). "Eligible bodies for TA2 class cars". Five Star Racing Race Car Bodies.
- Erickson, Keith. "Trans Am 3 Class intended vehicles" (PDF). 2017 Trans Am by Pirelli Rule Book. Retrieved 2 May 2017.
- Erickson, Keith. "2017 Trans Am by Pirelli Rule Book" (PDF). GoTransAm.cdn.Racersites. Retrieved 3 May 2017.
- Erickson, Keith (January 10, 2018). "Audible Flagging Systems Becomes Official Trans Am Series Flagging System". GoTransAm.com. Retrieved January 14, 2018.
- Erickson, Keith (July 16, 2017). "Trans Am Series presented by Pirelli debuts new Crystal Sensations Trophies at Sebring". Trans Am by Pirelli.
- Trans-Am Drivers' and Manufacturers' Champions As archived at web.archive.org
- "1966 Trans-Am Box Scores" (PDF). Sports Car Club of America. Archived from the original (PDF) on 17 July 2011. Retrieved 29 April 2011.
- "1967 Trans-Am Box Scores" (PDF). Sports Car Club of America. Archived from the original (PDF) on 17 July 2011. Retrieved 29 April 2011.
- "1968 Trans-Am Box Scores" (PDF). Sports Car Club of America. Archived from the original (PDF) on 17 July 2011. Retrieved 29 April 2011.
- "1969 Trans-Am Box Scores" (PDF). Sports Car Club of America. Archived from the original (PDF) on 17 July 2011. Retrieved 29 April 2011.
- "1970 Trans-Am Box Scores" (PDF). Sports Car Club of America. Archived from the original (PDF) on 17 July 2011. Retrieved 29 April 2011.
- "1971 Trans-Am Box Scores" (PDF). Sports Car Club of America. Archived from the original (PDF) on 19 July 2011. Retrieved 29 April 2011.
- de Jong, Frank. "1971 Trans-Am Championship Table". Touring Car Racing History. Archived from the original on 24 January 2005. Retrieved 2 May 2011.
- "1972 Trans-Am Box Scores" (PDF). Sports Car Club of America. Archived from the original (PDF) on 19 July 2011. Retrieved 29 April 2011.