Tool Required VB-FIX Required

Printpartsummary
Symptoms:
  • High line pressure with no indication of boost
  • Loss of lube oil
  • No line rise during TCC apply in 4th
  • No lockup
  • Overheated converter
  • TCC cycling
  • TCC slip under load
Cause:

Excess boost valve bore wear reduces oil pressure to the switch valve, resulting in a partial stroke position, restricting the converter and lube circuits.

Correction:

The Sonnax oversized lockup boost valve restores the proper pressures to the switch valve and main regulator valve, ensuring proper flow through the converter and lube circuit and correcting line pressure.

Tool Required VB-FIX Required

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

Oversized Lockup Boost Valve Kit

Part No.

22771-19K

Oversized Lockup Boost Valve Kit
  • 22771-19k_combo

  • Oversized Lockup Boost Valve Kit

Small_22771-19k_combo Small_22771-19k__1_

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

Oversized Lockup Boost Valve Kit

Part No. 22771-19K

  • Lockup Boost Valve
  • Plug Valve
  • Spring
  • Spring Retainer

Complaint:

  • High line pressure with no indication of boost
  • Loss of lube oil
  • No line rise during TCC apply in 4th
  • No lockup
  • Overheated converter
  • TCC cycling
  • TCC slip under load

Cause:

Excess boost valve bore wear reduces oil pressure to the switch valve, resulting in a partial stroke position, restricting the converter and lube circuits.


Correction:

The Sonnax oversized lockup boost valve restores the proper pressures to the switch valve and main regulator valve, ensuring proper flow through the converter and lube circuit and correcting line pressure.

Chrysler 42-46-47-48RH/RE transmissions are equipped with a lockup boost valve that is prone to wear. When this valve wears, it causes a loss of converter and lubrication flow, which can result in TCC slip and an overheated converter. Lockup boost valve wear also causes excessive line pressure, and line rise during TCC apply or in 4th gear can be lost. Sonnax offers an oversized lockup valve boost kit, 22771-19K, that restores the lockup boost circuit pressures. The lockup boost valve kit will correct TCC apply, lubrication and overheat problems, as well as maintain proper line pressure.

  • Both valves are hard-coat anodized aluminum to resist wear
  • The Sonnax spring is calibrated to match OE pressure with the oversized valves
NOTE:

Fits 90-later with boost oil delivery tube.

Required Tools

You need this if...

A visual inspection reveals wear, especially at the inboard end and valve plug end. Inspect and vacuum test as shown in illustration.

  • 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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