It feeds full time oil into the converter by bypassing the pr valve,that oil charges the converter then leaves the converter going to the cooler then to the rear fitting in the case that feeds the gear train lube. Never tow very far with the rear wheels on the ground without removing the driveshaft. The good thing about that hole is it feeds the converter and lube when max pressure is demanded and the regulator valve is all the way in effectively starving the rest of the tranny to save the friction elements. This is not just a mopar thing.The second style Transgo kit uses a light inner or spring with its own seat to allow the pr valve to move a wee bit before the main pr spring takes over,but has just enough pressure to seat the valve with the engine off. The manual valve is also modified to reduce drain back.
Sonnax makes a pr valve that mimics the line to lube hole with an orifice drilled in the valve and a check ball and spring to close the passage with the engine off.
Wear in any part of the hydraulic system will increase drain back,including the pump bushing.
Sonnax makes a pr valve that mimics the line to lube hole with an orifice drilled in the valve and a check ball and spring to close the passage with the engine off.
Wear in any part of the hydraulic system will increase drain back,including the pump bushing.