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


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


Sonnax drop-in TCC modulator plunger valve kit restores proper hydraulic clearances so fluid pressure can position the TCC modulator valve to fully apply lockup. The increased ratio assembly provides a firmer and quicker lockup feel.

5R55S, 5R55W

TCC Modulator Plunger Valve Kit
Part No. 56947J-01K

OE Ratio

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

Some common complaints associated with Ford 5R55W and 5R55S transmissions are high TCC slip RPMs under increasing loads, slip codes, and converter apply or release concerns. These complaints are often caused by wear at the I.D. of the TCC modulator plunger valve sleeve, due to constant oscillation by the pulse width modulated TCC solenoid. This plunger valve positions the TCC modulator valve, which feeds line to the apply circuit, which controls slip rate. Wear of the sleeve will allow the TCC slip rate to continue to rise, and could prevent full lockup.

Sonnax TCC modulator plunger valve kit 56947J-01K restores hydraulic integrity to the TCC solenoid circuit with precisely toleranced parts.

  • OE stock ratio restores original lockup feel
  • Precisely toleranced parts restore hydraulic integrity
  • Hardcoat anodized aluminum valve combats premature wear
  • High-grade aluminum sleeves are extremely wear-resistant
  • Drop-in Zip Valve parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs

The valve bore inward of this TCC modulator sleeve wears rapidly. Always inspect for bore wear at the largest spool of the inner valve.

  • Sleeve
  • Valve

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 5R55S, 5R55W Valve Body Layout

Ford 5R55S, 5R55W Valve Body Layout
  • 5R55S, 5R55W TCC Modulator Plunger Valve Kit 56947J-01K
  • 5R55S, 5R55W TCC Modulator Plunger Valve Kit 56947J-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.

5R55S, 5R55W TCC Modulator Plunger Valve Kit Vacuum Test Locations