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 improved oversized valve, O-ringed end plug and spring to restore proper hydraulic function and prevent future leakage.

5R55N

Oversized Reverse Modulator Valve Kit
Part No. 56947J-53K


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

The direct clutch is applied in reverse, 4th and 5th gear by the variable force PC-C solenoid. Fluid pressure from the solenoid is routed through the reverse 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 the leakage of the solenoid feed and direct clutch apply pressures, resulting in slipping or loss of 4th/5th gear, burned direct clutch and delayed reverse engagement. The Sonnax reverse modulator valve kit 56947J-53K can restore proper hydraulic function and prevent future leakage.

  • Critical valve spools incorporate annular grooves for better hydraulic centering and reduced wear
  • Critical valve spool length increased by almost 20% for increased sealing and stability
  • End plug incorporates O-ring to positively seal critical PC-C solenoid feed oil
  • Spring
  • Valve
  • End Plug
  • O-Rings (2) 1 Extra

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 Valve Body Layout
  • 5R55N Oversized Reverse Modulator Valve Kit 56947J-53K
  • 5R55N Oversized Reverse Modulator Valve Kit 56947J-53K

You need this if...

Vacuum test as indicated:

  1. A. Vaccum test here with valve in rest position. Leakage is loss of reverse pressure.
  2. B. Vacuum test here with valve stroked fully inward. Leakage is loss of PC-C feed and/or direct clutch apply.
5R55N Oversized Reverse Modulator Valve Kit Vacuum Test Locations