A torque converter oil cooling system includes an air-oil cooler system that is adapted to be disposed between a torque converter charging oil outlet and charging oil inlet. The torque converter oil cooling system has a controller that directs oil when at a predetermined temperature to pass through an air oil cooler for cooling and then directs the cooled oil back to the inlet of the torque converter for torque converter operation. The torque converter oil cooling system normally operates in the non-lockup mode operation of the torque converter. Using the torque converter oil cooling system permits a vehicle to continuously operate in a torque converter mode for an extended period of time, which becomes extremely helpful when the vehicle is called upon to haul heavy loads over steep grades.