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  • Lube failures
  • Delayed engagement
  • Converter drain back


Poor converter line feed pressure caused by worn-out PR bores leads to delayed engagements as well as pump bushing and lube failure.


The Sonnax valve kit offers increased stability while lube regulation improves converter feed at low RPM and high throttle conditions.


This pressure regulator valve and manual valve 22771-09 can be used independently, but are of greatest benefit when used as a pair.

42RE, 42RH, 46RE, 46RH, 47RE, 47RH, A727, A904

Oversized Lube Regulated Pressure Regulator Valve Kit
Part No. 22771A-07K

Original valve must match '78-later design

You need this if... View Instructions

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.

  • Oversized valve 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

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.

  • Valve
  • Plug
  • Spring

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.

Chrysler 42-46-47-48RH/RE Valve Body Layout

42 48rhefamily

November 14, 2016

Chrysler 46RE, 46RH, 47RE, 47RH Vacuum Test Guide

Topics: Vacuum Testing Vacuum Test Guides Transmission Chrysler 46RH Transmission 47RH Transmission 46RE Transmission 47RE Transmission

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  • 22771a 07k combo
  • 22771a 07k
  • 22771a 07k alt

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

  • 22771a 07k in test