Continuous movement of the pressure regulator valve wears the valve body bore in Aisin AW 450-43LE units. Bore and/or valve wear causes erratic line pressure resulting in delayed engagements, loss of lockup and high or low line pressure, depending on the area and extent of wear.
The boost assembly is designed to increase line pressure in Drive and Reverse. When the sleeve is worn on the inside, boost or EPC fluids can leak to exhaust or cross leak and increase forces on the valve. Leakage to exhaust reduces line rise. Cross-leaks can result in broken clutch drums or cases. Sonnax oversized pressure regulator and boost valve kit 94987-11K restores hydraulic control to these circuits.

Hardcoat anodized aluminum valves combat premature wear
Restores proper hydraulic sealing and OE pressure control

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