XI featured João Barbosa, Terry Borcheller, Ryan Dalziel, and Audi LMP1 driver Mike Rockenfeller.

Full season drivers Barbosa and Borcheller were joined by J. C. France for a few rounds, but did not find the podium again, finishing 13th in points.

9 Riley-Porsche, driven by Darren Law, IndyCar driver Buddy Rice, David Donohue, and Burt Frissele.

After reuniting Barbosa and France, the team opted to replace the latter with Law, scoring wins at Belle Isle and the 6 Hours of Watkins Glen.

The team opted to join Barbosa and Fittipaldi together for the remained of the season after Road Atlanta, and the pair scored two wins at Mid-Ohio and Watkins Glen.

AXR took three wins, including the team's second Rolex 24, en route to both the inaugural title and North American Endurance Cup for the No.

[6] The Mustang Sampling car then won at Long Beach, with the Whelen Engineering Racing squad taking a victory at Detroit, and eventually capturing both the WSCC and NAEC for 2018.

31 from Extreme Speed Motorsports, filling a void left by Eric Curran's move to endurance driver role.

Additionally, Christian Fittipaldi will leave the driver's seat as he finishes his transition to a management role following the 2019 Rolex 24 at Daytona.

Simon Pagenaud, Kamui Kobayashi and Mike Rockenfeller joined Johnson in the car, which finished 2nd at the Rolex 24 at Daytona.

Johnson's former Hendrick teammate and defending NASCAR champion Chase Elliott joined the #31 Whelen Engineering Cadillac DPi-V.R team during the Rolex 24 at Daytona as well.