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.
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.
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.
February 21, 2013
Topics: Vacuum Testing Vacuum Test Guides Transmission Ford 5R55W Transmission 5R55S TransmissionRead Now
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A vacuum test at the port indicated fails to hold at least 18 in-Hg.