Oil level control, function - GF27.10-P-3024GZ

TRANSMISSION 722.9 in MODEL 164.1 /8, 204.0, 216, 221, 251.0 /1 up to Model Year 8 

The oil level regulating system seals the openings between the oil gallery and gear set chamber so that the rotating gear sets do not churn in the oil as the oil level rises.

The power losses occurring are reduced and oil is prevented from being thrown out of the transmission housing at high temperatures.