In Chrysler A727, A904, 42-46-47RH/RE units (RWD '78-later with TCC), the cooler/converter charge circuit is not opened until the pressure regulator valve moves far enough to flow oil. The industry fix of drilling a small orifice between line pressure and cooler circuit ensures flow to the converter/lube circuit, but the hole also increases the converter drain back problem because ATF can drain when the engine is turned off. Sonnax offers a standard-size pressure regulator valve,22771A-02K, that resolves these problems, but this valve will not repair severely worn valve bodies. In such cases, Sonnax recommends installing oversized pressure regulator valve kit 22771A-07K for increased stability and improved lube regulation.

• 超大的瓦尔ve is designed with an internal check valve that allows oil to flow into the converter charge circuit as soon as the vehicle is started
• Internal valve shuts down once line pressure reaches normal levels
• With engine off, the internal check valve prevents fluid from draining out through the orifice, reducing converter drainback