Symptoms:

Delayed Reverse
No Reverse
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 the Sonnax oversized valve and end plugs to restore proper hydraulic function and prevent future wear.

5R55N

Oversized Reverse Engagement Valve Kit
Part No. 56947J-59K

Tooling:

F-27741-TL13
VB-FIX

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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 gear, burned direct clutches or delayed reverse engagement. The Sonnax reverse engagement valve kit 56947J-59K 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.

Contents

Valve
End Plugs (2)

Valve Body Layout

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.