Symptoms:

  • TCC apply & release concerns
  • Inadequate lubrication
  • TCC codes

Cause:

A sticking lockup relay control sleeve prevents TCC apply or release. Sleeve wear reduces converter pressure, overheating the fluid and results in bushing and solenoid failure.

Correction:

The tightly toleranced, drop-in replacement Sonnax lockup relay control valve kit restores proper hydraulic clearances, and uses upgraded materials to prevent wear.

55-50SN, 55-51SN

Lockup Relay Control Valve Kit
Part No. 59947-01K

Also fits AF23/33 and RE5F22A units.

You need this if... View Instructions Find a Distributor

Aisin AW 55-50SN and AW-51SN transmissions can have TCC apply and release complaints, inadequate lubrication and TCC codes as a result of wear at the inside diameter of the lockup relay control sleeve due to continuous valve oscillation. This results in valuable converter feed pressure to flow directly to exhaust and prevents the relay control valve from properly positioning the inboard valve to control the flow of apply and release oil to the converter. Installing the Sonnax drop-in lockup relay control valve kit 59947-01K restores proper hydraulic control with a highly wear-resistant billet sleeve and hard-coat anodized aluminum valve.

  • Sleeve is manufactured from highly wear-resistant billet aluminum.
  • Hardcoat anodized aluminum valve combats premature wear
  • Drop-in Zip Valve parts install quickly and easily
  • Valve
  • Sleeve

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.

Aisin AW 55-50SN, 55-51SN Valve Body Layout

Aisin AW 55-50SN, 55-51SN Valve Body Layout
  • 55-50SN, 55-51SN Lockup Relay Control Valve Kit 59947-01K
  • 55-50SN, 55-51SN Lockup Relay Control Valve Kit 59947-01K

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

55-50SN, 55-51SN Lockup Relay Control Valve Kit Vacuum Test Locations