Originally posted by blackplague
The out to cooler circuit has two lines that feed it. one has the orificed cup plug and the other is wide open. When the valve is unlocked { valve towards solenoid } the apply\return line from the converter is feeding both circuits. When the valve locks, {valve away from the solenoid} the third land {counting from either end of the valve} blocks off the open end of the to cooler circuit and forces the lube oil thur the orifice only. Grinding the third land on the lock up valve lets oil from converter feed to the open cooler circuit. {in theory}