September 30, 2005
In Aisin AW TF-80SC, TF-81SC transmissions, the boost sleeve wears from repeated oscillation of the boost valve, allowing Reverse pressure to exhaust. This can result in delayed Reverse, low line pressure in Reverse and/or burnt C3 and B2 brake clutches. Sonnax boost valve kit 39741-44K eliminates these concerns and restores proper hydraulic control.
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.
A vacuum test at the port indicated fails to hold at least 18 in-Hg.