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  • Burnt Forward clutch
  • Loss of Forward
  • Delayed Forward
  • Slipping gears


Wear at the forward engagement valve bore can prevent proper valve positioning, allowing forward clutch feed pressure to be reduced.


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


Oversized Forward Engagement Valve Kit
Part No. 56947J-56K

You need this if... View Instructions

Line pressure from the manual valve is routed through the forward engagement valve in all forward gears prior to applying the forward clutch. Excessive wear at the valve bore or end plug can prevent solenoid feed oil pressure from correctly positioning the engagement valve or allow forward clutch feed pressure to exhaust. This reduced pressure can result in slipping or loss of forward gears, burnt forward clutch or delayed forward engagement. The Sonnax forward engagement valve kit 56947J-56K can restore proper hydraulic function and prevent future wear.

  • Associated tool kit F-27741-TL13 can be used with multiple Sonnax kits, including one other 5R55N application, three 5R55W and 5R55S applications, and a Toyota U150/U250E application.
  • Valve
  • End Plug
  • 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 5R55N Valve Body Layout

Ford 5r55n
  • 56947j 56k combo
  • 56947j 56k

You need this if...

Vacuum testing shows wear/leakage.

  • 56947j 56k test