Oversized Lockup Control Valve & Boost Valve Kit, for 55-50SN, 55-51SN, Sonnax
Oversized Lockup Control Valve & Boost Valve Kit, for 55-50SN, 55-51SN, Sonnax
Oversized Lockup Control Valve & Boost Valve Kit, for 55-50SN, 55-51SN, Sonnax

Oversized Lockup Control Valve & Boost Valve Kit, for 55-50SN, 55-51SN, Sonnax

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  • $85.67
Hello, If you need assistance finding a part please supply the VIN number of your NORTH AMERICAN vehicle AND the part number you are looking for. 

Symptoms:

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

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.

55-50SN, 55-51SN

Oversized Lockup Control Valve & Boost Valve Kit

Part No. 59947-29K

    REQUIRES TOOLING: F-59947-TL29
      REQUIRES VB-FIX: VB-FIX

Also fits AF 23/33 and RE5F22A units.

Bore wear at the lockup control valve in listed units 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 oversized lockup control valve and boost valve 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 hardcoat 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

F15741-TL29PL is required for securing small No. 2 rear control valve body to VB-FIX.

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