Sonnax 77917-471 TV Boost Valve Kit .471" Diameter for GM 700R4 200-4R 4L60 Transmissions

The Sonnax 77917-471 throttle valve (TV) boost valve kit is designed to eliminate common transmission failures in GM 200-4R, 700R4, and 4L60 automatic transmissions. This performance upgrade addresses burned bands and 3-4 clutch failures by eliminating throttle boost oil leakage and increasing line pressure throughout all gears.

Featuring a .471" diameter design, this kit is specifically engineered for higher line pressure applications, making it ideal for towing, off-road use, and performance driving. The boost valve increases holding pressure on clutches in relation to throttle position, resulting in firmer shifts, improved transmission longevity, and enhanced horsepower handling capabilities.

Key Features:

• Throttle valve boost valve and sleeve manufactured from hardened steel for superior wear resistance
• O-rings on sleeve separate throttle pressure and reverse boost circuits, preventing cross-leaks
• O-rings prevent oil loss between the throttle valve sleeve outer diameter and pump body
• Drop-in Zip Valve™ design installs quickly and easily with transmission in vehicle
• .471" diameter provides optimized line pressure for towing and high-performance applications

Kit Includes: Boost valve, sleeve, and two O-rings

This Sonnax valve body upgrade is part of a complete line of TV boost valve kits available in .423", .471", and .500" diameters to suit various performance requirements and vehicle applications.