• Soft slide shifts
  • 3-4 Clutch burned
  • Reduced band life


MTV boost loss and insufficient line rise.


Sonnax drop-in TV boost valve kit prevents oil loss between the outside diameter of the TV sleeve and the pump body.

200-4R, 4L60

TV Boost Valve Kit
Part No. 77917-02K

.423" Bore Dia., Factory Style

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A common problem in GM 200-4R and 4L60 transmissions is burned bands and/or 3-4 clutches. This failure can be reduced by eliminating throttle boost oil leakage. Sonnax TV boost valve kits 77917-02K (.423" dia.), 77917-03K (.471" dia.) and 77917-04K (.500" dia.) eliminate these problems in a variety of applications. For V6 applications and smaller vehicles, use Sonnax TV boost valve kit 77917-02K.

  • Throttle valve boost valve and sleeve are manufactured from hardened steel for better wear resistance
  • Kits available in three sizes for .423", .471" and .500" diameters for a variety of applications
  • Drop-in Zip Valve™ parts install quickly and easily
Sonnax Part No. Sleeve Dia. Performance Applications
77917-02K .423" dia. Minimum line pressure for V6 applications and smaller vehicles
77917-03K .471" dia. Higher line pressure for towing and off-road
77917-04K .500" dia. Maximum line pressure and shift feel for high performance applications

Learn More About Zip Valve™ Drop-In Repairs
  • Valve
  • Sleeve

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

GM 200-4R Valve Body Layout

GM 200-4R Valve Body Layout

GM 4L60 (700-R4) Valve Body Layout

GM 4L60 (700-R4) Valve Body Layout
  • 200-4R, 4L60 TV Boost Valve Kit 77917-02K
  • 200-4R, 4L60 TV Boost Valve Kit 77917-02K