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


  • Overheated fluid
  • Slip codes
  • High TCC slip RPM at increasing load


The plunger force is transferred onto the inner modulator valve. When the sleeve wears, the converter apply pressure is reduced and TCC slippage increases.


The wear-resistant Sonnax kit prevents future wear and restores proper hydraulic clearances so fluid pressure can position the TCC modulator valve to fully apply lockup.


TCC Modulator Plunger Valve Kit
Part No. 56947J-32K

You need this if... View Instructions

Common complaints with a 5R55N are high TCC slip RPM at increasing load, slip codes, and converter apply or release concerns. These complaints can be caused by wear of theTCC plunger valve and sleeve assembly due to constant oscillation by the pulse width modulated TCC solenoid.

  • Plunger 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.

Ford 5R55N Valve Body Layout

Ford 5r55n
  • 56947j 32k combo
  • 56947j 32k

You need this if...

A vacuum test fails to yield 18 in-hg or greater, or if visual wear is detected.

  • 56947j 32k test