On June 2, 2012, Truex got a career best finish of second at Dover International Speedway driving for JGR. Racing shortly after an emergency appendectomy, he started the race first after winning his first career Nationwide Series pole, and led late before being caught in lapped traffic by Joey Logano.
In 2014, the No. 22 car was shared by Joey Logano, Brad Keselowski, Ryan Blaney, and Alex Tagliani in hopes of defending the Nationwide Owners' Championship. Michael McDowell ran the car at Kentucky in September, the 5th driver to run the car in 2014. The 22 team beat the 54 JGR team once again for the owner's title.
In February 2013, Truex announced that he would compete in the Camping World Truck Series for Turner Scott Motorsports at Daytona International Speedway; he hoped to compete in further races during the year, and registered to compete for the series' Rookie of the Year title.
In addition, he signed with Phoenix Racing to compete in the Sprint Cup Series, competing in at least one race at Richmond International Raceway, as well as at Indianapolis Motor Speedway for the team in the Nationwide Series; his debut in the Sprint Cup Series and his Nationwide Series race were later delayed due to Truex suffering a broken collarbone.
On June 2, 2013, it was announced that Truex had signed with Richard Petty Motorsports as a development driver; in mid-July it was announced that he would make his Sprint Cup debut with Phoenix Racing in the Irwin Tools Night Race at Bristol Motor Speedway driving James Finch's #51.
After Harry Scott, Jr.'s takeover of the #51 team two weeks later, Truex drove for Scott in his first race as team owner at Richmond International Raceway.
He drove for Scott again at his home track of Dover International Speedway, finishing 32nd.
Finch's approach to the Finch SS100 is somewhat different to the other SS100 replica manufacturers. Finch endeavoured to recreate their Finch SS100 as faithfully as possible and do not use the XJ6 as the base donor car. Finch sourced original factory drawings and build their SS100 chassis to the original design. The bodies of the Finch SS100 are made from aluminium metal-shaped to fit the traditional wooden frames built by Finch. Finch SS100 mechanicals are sourced from 'deceased' MkIV and SS Jaguars to obtain contemporary components.