New school meets old school meets new school is the story of Project C4orce's drivetrain. Between the LSx engine and Tremec TKO-600 transmission is a bellhousing of the type that first saw the light of day in the late '60s. The original C4 bellhousing couldn't be retained because it's designed to fit a 153-tooth flywheel and LSx engines utilize a 168-tooth wheel and matching starter. Everything fits together nicely, and the Tremec transmission fits the chassis with plenty of room to spare. Alternatively, Classic Motorsports makes their own LS-to TKO aluminum bellhousing. This unit has all the correct bolt hole locations built into the bellhousing to properly match up with the LS motors.