Tool Required VB-FIX Required

Printpartsummary
Symptoms:
  • Converter drainback
  • Delayed engagement
  • Lube failures
Cause:

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

Correction:

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

Tool Required VB-FIX Required

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

Oversized Lube Regulated Pressure Regulator Valve Kit

Part No.

22771A-07K

Oversized Lube Regulated Pressure Regulator Valve Kit
  • 22771a-07k_combo

  • Oversized Lube Regulated Pressure Regulator Valve Kit

  • 22771a-07k_alt

Small_22771a-07k_combo Small_22771a-07k Small_22771a-07k_alt

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

Oversized Lube Regulated Pressure Regulator Valve Kit

Part No. 22771A-07K

  • Valve
  • Plug
  • Spring

Original valve must match 78 & later design

Complaint:

  • Converter drainback
  • Delayed engagement
  • Lube failures

Cause:

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


Correction:

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

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 drainback 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
WARNING:

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

NOTE:

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.

  • Patent No. 6,712,726

Required Tools

Related Parts

You need this if...

The regulator valve fails a wet air test at the port indicated. To test, place a small amount of oil into the orificed line port. Follow with low air pressure.

  1. If a line-to-lube hole has been drilled in the PR valve circuit, it should be plugged to reduce converter drainback.
  2. Inspect the line pressure plug and sleeve. Leakage here will result in poor line pressure control.
  3. Inspect the TV checkball separator plate seat. Leakage here may produce stacked shifts and/or no kickdown.

  • Test Locations

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Valve Body Layouts

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.

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

Related Tech Articles

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