Symptoms:

  • Delayed Reverse
  • No Reverse
  • Slipping gears
  • Direct clutch burned

Cause:

Wear at the Reverse engagement valve bore can prevent proper valve positioning, allowing Reverse pressure, which applies the direct clutch, to be reduced.

Correction:

Refurbish the valve bore and install Sonnax Reverse engagement valve kit to restore proper hydraulic function and prevent future wear.

5R55S, 5R55W

Reverse Engagement Valve Kit
Part No. 56947J-29K


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

In Ford 5R55S and 5R55W units, Reverse pressure from the manual valve is routed through the Reverse engagement valve prior to applying the direct clutch. Excessive wear at the valve bore can prevent solenoid feed oil pressure from correctly positioning the engagement valve, allowing reverse pressure to be reduced. Low Reverse pressure can result in slipping or loss of Reverse, burned direct clutches or 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 in for 27741-13K, 56947J-23K, 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 Reverse Engagement Valve Kit 56947J-29K
  • 5R55S, 5R55W Reverse Engagement Valve Kit 56947J-29K

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 Reverse Engagement Valve Kit Vacuum Test Locations