This pressure regulator valve and manual valve 22771-09 can be used independently, but are of greatest benefit when used as a pair.
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.
Also available, Sonnax line pressure plug and sleeve kit 22229-01K can be used to replace all OE sizes and has a reduced plug to increase reverse boost.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.