Tool Required VB-FIX Required

Printpartsummary
Symptoms:
  • Harsh Reverse
  • High SLT pressure
  • Low SLT pressure
  • Overheated fluid, bushings & converter
  • Poor shift quality
  • TCC slip
  • TCC surge
Cause:

Bore wear at the spring end of the valve allows the SLT circuit and regulated converter pressure to cross leak. Bore wear at the balance end of the valve reduces converter and lube flow.

Correction:

Install the Sonnax Secondary Regulator Valve & Spring kit to restore hydraulic integrity to the circuit.

Tool Required VB-FIX Required

55-50SN, 55-51SN

Oversized Secondary Regulator Valve Kit

Part No.

59947-16K

Oversized Secondary Regulator Valve Kit
  • 59947-16k_combo

  • Oversized Secondary Regulator Valve Kit

Small_59947-16k_combo Small_59947-16k

55-50SN, 55-51SN

Oversized Secondary Regulator Valve Kit

Part No. 59947-16K

  • Valve
  • Spring

Also fits AW55-51SN, AF 23/33 and RE5F22A units.

Complaint:

  • Harsh Reverse
  • High SLT pressure
  • Low SLT pressure
  • Overheated fluid, bushings & converter
  • Poor shift quality
  • TCC slip
  • TCC surge

Cause:

Bore wear at the spring end of the valve allows the SLT circuit and regulated converter pressure to cross leak. Bore wear at the balance end of the valve reduces converter and lube flow.


Correction:

Install the Sonnax Secondary Regulator Valve & Spring kit to restore hydraulic integrity to the circuit.

  • Salvages valuable core.
  • Improved valve support to reduce wear.
  • Improved converter feed and lube flow.
  • Anodized aluminum valve replaces OE steel valve for better clearance control with the aluminum casting.

Required Tools

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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 Aisin AW 55-50SN

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