In 1962, Colin Chapman asked Colotti to design and build a transaxle for a car designed for Indianapolis 500. This high torque specification 4-speed "T.37" transaxle was designed for Small Block Ford-based engines. In the Lotus 29, which had a Ford 256 CID all-aluminium pushrod V-8 based on the cast-iron Fairlane 260 CID V-8, a "T.37" with two speeds blanked off was used. The car went on to score the second and seventh-place finishes at the 1963 Indy 500 in the hands of Jim Clark and Dan Gurney, respectively.