Aisin AW TF-80/81SC transmissions may exhibit various concerns related to line pressure instability caused by wear in the main pressure regulator bore. This results in excess line pressure, harsh shifting and reduced cooler flow that leads to overheating. Additional problems such as poor line rise, erratic shift quality and burnt clutches can surface when the boost sleeve wears. Installation of Sonnax oversized main pressure regulator and boost valve kit 39741-01K re-establishes critical valve-to-bore clearance and restores normal line pressure operation.

Hardcoat anodized aluminum valves combat premature wear
Sleeve is made from high-quality aluminum to reduce wear

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