A torque converter includes a cover for receiving torque from a prime mover, an impeller fixed to the cover to form a housing for the torque converter, a turbine disposed in the housing for receiving torque from the impeller, and a clutch backing plate fixed to the housing and arranged to receive a force, in an axial direction, from the turbine during operation of the torque converter. , at which temperature its kinematic viscosity, as measured by ASTM D-445, is above 8 cSt, has an initial boiling point of least 850\xb0 F. The test circuit is configured to facilitate determination of a drift profile associated with the receiver clock based on detection and tracking of a test signal received by the test circuit, where the test signal comprises at least one continuous wave signal. At least some of the drive components are located in a cooling circuit.