Symptoms:

  • TCC codes
  • TCC apply & release concerns
  • TCC shudder
  • Lube failures
  • Bearing failure
  • Bushing failure

Cause:

Bore wear at the secondary pressure regulator valve allows EPC oil and/or balance oil leakage and pressure loss.    

Correction:

Ream the bore and install the oversized Sonnax secondary pressure regulator valve and end plug.  

U660E, U660F, U760E, U760F

Oversized Secondary Pressure Regulator Valve Kit
Part No. 47740-26K


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

Toyota/Lexus U660E/F and U760E/F six speed automatic transmissions can experience several problems which can be traced back to the secondary pressure regulator valve. These include transmission overheat, bushing and bearing failures along with other lube related failures. TCC operation can also be negatively affected.

One cause for these problems is bore wear at the secondary pressure regulator valve. This allows SLT and/or balance oil to leak, resulting in low cooler and lube circuit pressures. To restore the bore and correct circuit pressures, ream the bore and install the Sonnax oversized secondary pressure regulator valve kit, 47740-26K.

  • Hardcoat anodized aluminum valve combats premature wear
  • Annular grooves on the valve help center it in the bore to reduce future side-load wear
  • Valve
  • End Plug

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.

Toyota/Lexus U660E/F, U760E/F Valve Body Layout

Toyota/Lexus U660E/F, U760E/F Valve Body Layout
  • U660E, U660F, U760E, U760F Oversized Secondary Pressure Regulator Valve Kit 47740-26K
  • U660E, U660F, U760E, U760F Oversized Secondary Pressure Regulator Valve Kit 47740-26K

You need this if...

Vacuum tests at the ports indicated fail to hold the recommended minimum in-Hg.

U660E, U660F, U760E, U760F Oversized Secondary Pressure Regulator Valve Kit Vacuum Test Locations