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The most destructive enemy to any high performance automatic transmission is inadequate line pressure. This often overlooked but easily addressed problem wastes horsepower by permitting excess slippage between clutch plates and/or low band-to-drum clamping pressure, causing slower shifts, increased wear, higher operating temperature, wasted horsepower, contaminated fluid, and imminent premature transmission failure.

The engineers at TCI® addressed these problems by bringing to market their new .570" Boost Valve (Part #374501) for high performance GM 4L60E transmissions. Installing this new largediameter boost valve in your high performance 4L60E application will significantly increase line pressure, providing more clutch & band clamping load for quicker shifts, lower operating temperatures and extended transmission life.

The new TCI® .570” Boost Valve is the largest in the industry and, when paired with the TCI® Trans-Scat® Kit, will produce line pressure in the 290-310psi range. This dramatically increased line pressure provides the best clamping pressure through all throttle positions to yield the quickest shifts and maximize the life of your performance 4L60E transmission.