Bore wear at the lockup control valve in Aisin AW55-50SN transmissions results in loss of torque converter clutch control. The TCC can remain applied transferring shift shock, or loss of lockup control can result in RPM fluctuations. Sonnax lockup clutch control valve and boost valve assembly kit, 59947-29K restores control of the TCC. Proper TCC control eliminates the shift shock and RPM fluctuations associated with a worn lockup control valve.
F-15741-TL29PL is required for securing small No. 2 Rear Control Valve Body to VB-FIX.
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.
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Vacuum testing fails to yield 18" of vacuum or higher on the lockup valve test location, or vacuum testing fails to yield 16" of vacuum or higher on the boost valve test location.