5R55N, 5R55S, 5R55W

Symptoms:

• Soft & inconsistent shift feel
• Various concerns depending on location of leaking end plug

Cause:
Worn, damaged and deformed end plugs allow loss of critical hydraulic pressure.

Correction:
This kit replaces worn or deformed OE end plugs. The added O-rings greatly reduce or eliminate leakage where the bore is worn at the end plug.

In Ford 5R55W and 5R55S valve bodies, some end plugs and their bores are often worn due to small movements of the end plug within the bore. This motion is caused by continuous rapid fluctuations of fluid pressure, impact of a valve against the end plug face and spring forces where the end plug face is utilized as a spring seat. Additionally, the bore surface and end plugs can erode over time due to high pressure fluid squeezing between the bore and end plug. The Sonnax O-ringed end plug kit helps restore correct circuit pressures by replacing worn OE end plugs. The O-rings provide additional sealing to help prevent hydraulic losses in eroded bores.

• The tight cross-hole tolerance on the manual valve index adds stability to the loose linkage
• Manual valve index has been lengthened to allow it to act as a stop to prevent the Forward clutch circuit from being opened in Park

SONNAX Installation Instructions