Wear at the inboard end causes excessive feed pressure. This floods the solenoids, reduces reaction time, resulting in harsh shifting and high line pressure. Wear at the outboard spool allows fluid to leak into the sump port reducing solenoid modulator pressure. This loss has the most affect on engagements and boost oil for line pressure rise.
The Sonnax wear resistant sleeve and valve restores control of feed oil pressure sent to critical solenoids.
Pilot valve A feeds the line pressure modulating solenoid, and the TCC solenoid. Pilot valve B feeds the following solenoids: Direct and Input Clutch, Front Brake Band, Low Coast Brake and High & Low/Reverse. Various shift complaints, lock-up apply and line pressure problems can occur depending upon which bore is worn. The Sonnax sleeve and valve kit allows the valve body casting to be restored. With the improved materials and valve support, the service life can be extended beyond that of the OE casting
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.
Contact a Sonnax Parts Distributor.
Either a Wet Air Test or a Vacuum Test in the location shown, result in leakage. Vacuum test must hold a minimum of 18.