Entering the final race of the season at Road Atlanta, McCumbee and McAleer sat just one point clear at the top of the class championship over Andrew Carbonell.

Joining Bodymotion Racing in the former series, McAleer moved to the GS class, competing in a Porsche Cayman GT4 Clubsport MR alongside Joe Robillard.

McAleer's campaign in the Pirelli World Challenge was also shortened, as he competed in just ten of the 18 races for the Classic BMW team, placing on the podium once; a second-place finish at COTA.

[21] His Lamborghini Super Trofeo exploits yielded a second-place finish in the Pro-Am championship, with McAleer representing the professional co-driver to amateur driver Randy Sellari.

After adding another race victory at VIR in August,[25] McAleer came home second in the championship, 26 points behind Austin McCusker and Rodrigo Pflucker.

[26][27] Claiming two victories – at VIR[28] and Road America – and seven total class podiums, the duo scored the East Pro-Am Cup title on a points technicality.

[29] 2020 saw McAleer compete full-time in two IMSA-sanctioned series, returning to the IMSA Prototype Challenge alongside a Pro-class drive in the Lamborghini Super Trofeo North America.

[33] Continuing in GT4 competition, McAleer embarked on a part-time campaign in the Michelin Pilot Challenge with RS1, driving alongside Patrick Gallagher.

McAleer and co-driver Madison Snow also took second in the Pro class of the Lamborghini Super Trofeo North America, claiming their only victory of the season at COTA in May.

McAleer's stint in the IMSA-sanctioned series was short, but through six races he claimed three podium finishes alongside various co-drivers, including Eric Filgueiras, Alexandre Prémat, and John Capestro-Dubets.

[44] McAleer competed full-time in the IMSA SportsCar Championship in 2022, driving for Team Korthoff Motorsports in the GTD class paired with Mike Skeen for the full season.

[45] Despite never claiming a race victory, the team remained in the title fight for the majority of the season,[46][47] with McAleer eventually finishing third in the GTD standings with two podiums to his name.

[48][49] Following their championship triumph in 2022, McAleer and Filgueiras took on a full-season program in GT World Challenge America with RS1, taking part in the Pro class.

They claimed the Pro class championship at season's end, 44 points clear of second-place Mario Farnbacher and Ashton Harrison.

[60] In 2023, the team expanded to GT4 competition, fielding a Ford Mustang GT4 in the Michelin Pilot Challenge for McCumbee and former MX-5 Cup driver Jenson Altzman.

[61] The oldest of five brothers,[16] McAleer was raised in the town of Rutherglen on the south-eastern outskirts of Glasgow, and attended Stonelaw High School.