Tool Required VB-FIX Required

Printpartsummary
Symptoms:
  • Burnt Forward clutch
  • Delayed Forward
  • Loss of Forward
  • Slipping
Cause:

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

Correction:

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

Tool Required VB-FIX Required

5R55S, 5R55W

Oversized Forward Engagement Valve Kit

Part No.

56947J-26K

Oversized Forward Engagement Valve Kit
  • 56947j-26k_combo

  • Oversized Forward Engagement Valve Kit

Small_56947j-26k_combo Small_56947j-26k

5R55S, 5R55W

Oversized Forward Engagement Valve Kit

Part No. 56947J-26K

  • Valve
  • Sleeve
  • Spring

Complaint:

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

Cause:

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


Correction:

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

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

Required Tools

You need this if...

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

  • Test Locations

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Valve Body Layouts

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.

Valve Body Layout Ford 5R55W/S

Related Tech Articles

Sonnax

Ford 5R55W/S Vacuum Test Guide

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