This lesson covered the following key learning points:
Power shift transmissions house multiple components, requiring many lubrication needs. The torque converter needs low-viscosity oils with excellent low-temperature performance, and wet clutch packs need specific friction properties and durability.
Transfer boxes split the power flow from the engine to the front and rear drive axles. They do not require dedicated oil.
Differential gears transmit power from the engine to a pair of drive wheels. Oil must protect the gears and bearings against wear.
Final drives reduce rotating speed and increase torque. Transmission oil faces a lot of stress, and oil film needs to be very strong with high viscosity.