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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 presure to be reduced.


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

5R55S, 5R55W

Oversized Forward Engagement Valve Kit
Part No. 56947J-26K

You need this if... View Instructions

In Ford 5R55W and 5R55S units, 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 clutches or delayed forward engagement. Sonnax forward engagement valve kit 56947J-26K will restore proper hydraulic function and prevent future wear.

  • 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
  • Valve is hardcoat anodized to reduce wear and incorporates annular grooves to hydraulically center itself in the bore
  • 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 5R55W/S Valve Body Layout

Ford 5r55ws vbl

February 21, 2013

Ford 5R55W/S Vacuum Test Guide

Topics: Vacuum Testing Vacuum Test Guides Transmission Ford 5R55W Transmission 5R55S Transmission

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  • 56947j 26k combo
  • 56947j 26k

You need this if...

A vacuum test at the port indicated fails to hold at least 18 in-Hg.

  • 56947j 26k test