Symptoms:

  • Delayed Reverse
  • No 4th
  • No 5th
  • Direct clutch burned

Cause:

Wear at the reverse modulator valve bore due to constant oscillation allows leakage of variable solenoid feed and direct clutch apply pressure.

Correction:

Refurbish the valve bore and install the Sonnax sleeve, valve and spring to restore proper hydraulic function and prevent future wear.

5R55S, 5R55W

Oversized Reverse Modulator Valve Kit
Part No. 56947J-23K


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

In Ford 5R55S and 5R55W units, the direct clutch is applied in Reverse, 4th and 5th Gear by the variable force PC-C solenoid. Fluid pressure from the solenoid (VFS3) is routed through the Reverse pressure modulator and reverse engagement valves, which then stroke appropriately to route apply pressure to the direct clutch. Wear at the Reverse pressure modulator valve bore and end plug results in leakage of the solenoid feed and direct clutch apply pressures, resulting in slipping or loss of 4th/5th Gear, burned direct clutches and delayed Reverse engagement.

  • Sleeve manufactured from highly wear-resistant aluminum incorporates the end plug to prevent instability and wear, and provides more sleeve/valve contact for better hydraulic sealing.
  • Anodized aluminum valve incorporates annular grooves to hydraulically center valve and combat premature wear
  • Tool kit can also be used for 27741-13K, 56947J-29K, 56947J-56K and 56947J-59K
  • Valve
  • Sleeve
  • 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 5R55S, 5R55W Valve Body Layout

Ford 5R55S, 5R55W Valve Body Layout
  • 5R55S, 5R55W Oversized Reverse Modulator Valve Kit 56947J-23K
  • 5R55S, 5R55W Oversized Reverse Modulator Valve Kit 56947J-23K

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 Oversized Reverse Modulator Valve Kit Vacuum Test Locations