sonnax-black Facebook-color LinkedIn-color maillink printlink r_and_r_only SERVOFIX-logo-web Twitter-color VBFIX-logo-web video-logo-web warranty_only Youtube-color


  • Converter shudder & TCC slip
  • Loss of fuel economy
  • Lube failures
  • No lockup
  • Overheated fluid & TCC lining
  • Poor converter & cooler oil flow
  • TCC apply & release concerns
  • TCC codes


Bore wear at the TCC regulator valve allows pressure loss that leads to TCC and cooler/lube concerns.


Recover hydraulic control and renew TCC performance by reconditioning the bore and installing Sonnax oversized TCC regulator valve kit.


Oversized TCC Regulator Valve Kit
Part No. 33740-03K

You need this if...

Ford CFT30 transmissions often exhibit TCC apply and release concerns, overheated fluid, poor cooler and lube flow, fuel economy drop, and/or TCC codes. These symptoms may be caused by excess wear of the TCC regulator valve bore, which allows crucial control pressure to escape the circuit. Reconditioning the bore and installing Sonnax oversized TCC regulator valve kit 33740-03K restores critical clearances for renewed TCC/cooler/lube operation.

  • Hardcoat anodized aluminum valve combats premature wear
  • Spring calibrated to restore OE function
  • Annular grooves help center valve in bore to reduce future side-load wear
  • Valve
  • Spring

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.

Ford CFT30 Valve Body Layout

Fd cft30 vbl

March 07, 2016

Ford CFT30 Vacuum Test Guide

Topics: Vacuum Test Guides Vacuum Testing Transmission Ford CFT30 Transmission

Read Now

September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

Gregg Nader

Topics: Diagnostics And Theory Transmission

Read Now
  • 33740 03k combo
  • 33740 03k

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.

  • 33740 03k test