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  • Damaged valve body casting
  • TCC lining failure
  • Code P0741
  • Excess TCC slip
  • Overheated converter
  • Low cooler flow


Valve and bore wear due to oscillation and contamination.


The Sonnax oversized TCC control valve salvages the valve body and restores TCC apply and release pressure.

5R55N, 5R55S, 5R55W

Oversized TCC Control Valve Kit
Part No. 56947J-05K

View Instructions

Some common complaints associated with a 5R55N and/or 5R55W and 5R55S are high TCC slip, slip codes 741, TCC lining degradation, and converter apply or release concerns. These complaints are often caused by wear at the TCC control valve casting bore. Although the control circuits used to stroke the control valve in the 5R55N differ from the 5R55W and 5R55S units, the TCC control valve is the converter oil switch valve, ultimately directing converter apply or release oil in both designs. The Sonnax oversized valve works in both the 5R55N and 5R55W and 5R55S, and allows the valve body bore to be refurbished to restore proper TCC modulator/apply circuit fluid pressure control.

  • Precisely toleranced parts restore proper TCC modulator/apply circuit pressure control.
  • Valve is made from hard coat anodized aluminum to prevent wear.
  • Valve incorporates the balance line feed hole used in the 5R55N OE design.
  • One replacement valve fits both 5R55N and 5R55W and 5R55S applications.

The modulator sleeve and inner modulator valve must be inspected for probable bore wear.

  • Valve
  • Plug
  • Springs (2)
  • Dowel Pin

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 5R55W/S Valve Body Layout

Ford 5r55ws vbl

Ford 5R55N Valve Body Layout

Ford 5r55n

February 21, 2013

Ford 5R55W/S Vacuum Test Guide

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