No one knows transmissions & torque converters like

Sonnax

No one knows transmissions & torque converters like 2008-sonnax-logo-white

Transmission

Printpartsummary
Symptoms:
  • Harsh downshifts
  • Overheated converter fluid
  • RPM surge on coast
  • RPM surge on light acceleration
  • TCC apply & release concerns
  • TCC codes
Cause:

Bore wear at the TCC control valve and/or sleeve results in the torque converter clutch remaining applied and transferring the shift shock. Loss of TCC control also results in RPM fluctuation.

Correction:

The Sonnax oversized lockup control valve and boost assembly kit corrects circuit pressure loss and restores control of the TCC lockup circuit.

Tool Required Icon

Oversized Lockup Control Valve & Boost Valve Kit

Part No.

59947-29K

55-50SN, 55-51SN

  • 59947-29k_combo

  • Oversized Lockup Control Valve & Boost Valve Kit

Small_59947-29k_combo Small_59947-29k
Tool Required Icon

Oversized Lockup Control Valve & Boost Valve Kit

Part No.

59947-29K

  • Lockup Control Valve
  • Boost Valve
  • Boost Sleeve
  • Boost Spring

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

Complaint:

  • Harsh downshifts
  • Overheated converter fluid
  • RPM surge on coast
  • RPM surge on light acceleration
  • TCC apply & release concerns
  • TCC codes

Cause:

Bore wear at the TCC control valve and/or sleeve results in the torque converter clutch remaining applied and transferring the shift shock. Loss of TCC control also results in RPM fluctuation.


Correction:

The Sonnax oversized lockup control valve and boost assembly kit corrects circuit pressure loss and restores control of the TCC lockup circuit.

Bore wear at the lockup control valve in Aisin AW55-50SN transmissions results in loss of torque converter clutch control. The TCC can remain applied transferring shift shock, or loss of lockup control can result in RPM fluctuations. Sonnax lockup clutch control valve and boost valve assembly kit, 59947-29K restores control of the TCC. Proper TCC control eliminates the shift shock and RPM fluctuations associated with a worn lockup control valve.

  • Both hard-coat anodized aluminum lockup control valve and boost valve resist wear and fit tighter to the bore than OE for better sealing
  • The boost sleeve is highly wear-resistant to increase life

You need this if...

Vacuum testing fails to yield 18" of vacuum or higher on the lockup valve test location, or vacuum testing fails to yield 16" of vacuum or higher on the boost valve test location.

  • Test Locations

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Contact a Sonnax Distributor to purchase this part.