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  • Lube failures
  • Pressure regulator buzz
  • Delayed engagement
  • Converter bushing failure


Poor converter line feed pressure causes delayed engagement, pump bushing and lube failure.


Install this steel valve for improved stability. Lube regulation improves converter feed at low RPM and high throttle conditions.


To prevent converter slippage, restricted cooler flow and possible hydraulic noise, remove the cooler line drainback valve.

42RE, 42RH, 46RE, 46RH, 47RE, 47RH, 48RE, A727, A904

Lube Regulated Pressure Regulator Valve
Part No. 22771A-02K

OE valve must match '78-later design. See instructions for details.

View Instructions

Under extreme pressure or temperature conditions, the converter/lube circuit in listed Chrysler RWD units can be restricted by the PR valve. The practice of drilling a hole between passages is problematic. This outdated technique contributes to slow engagements or — if the hole is improperly drilled — excessive converter pressure and low line pressure.

The best way to improve oil flow is to replace the OE valve with Sonnax lube regulator pressure regulator valve 22771A-02K, which ensures oil flow under extreme operating conditions and prevents drainback when the truck is off.

  • Improves converter feed/lube oil flow at critical low RPM and high load conditions
  • Redesigned valve prevents fluid drainback & slow engagements
  • Helps charge the converter in Park
  • 22771A-02K and Sonnax 22771-09 can be used independently, but are of greatest benefit when used as a pair PR valve/manual valve pair

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 26, 2004

The Cure for the Common (Chrysler RWD) Cold

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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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September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

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Topics: Diagnostics And Theory Transmission

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