Automatic Transmission Shift Kit - TH400 - Kit

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Reference Information

Transmission Upgrade Kit, Valve Body Performance Improver, GM, TH400, Kit

TCI valve body performance improver kits are designed to change the shift action to a more positive shift. Reduced shift time can add life to the clutches and bands and remove the lag time between shifts. These kits are easy to install and come with the necessary parts and gaskets to install the valve body.