• 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. 77917-01K

.423" Dia., O-Ring 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. The Sonnax TV boost valve kits 77917-01K (.423" dia.), 77917-471 (.471" dia.) and 77917-500 (500" dia.) eliminate these problems for a variety of applications. For minimal line pressure in V8 applications, use Sonnax TV boost valve kit 77917-01K.

  • Throttle valve boost valve and sleeve are made from made from hardened steel for better wear resistance
  • O-Rings on sleeve separate throttle pressure and Reverse boost circuits, providing additional protection against cross-leaks
  • O-Rings prevent loss of oil between the outside diameter of the throttle valve sleeve and pump body
  • Drop-in Zip Valve™ parts install quickly and easily
Sonnax Part No. Sleeve Dia. Performance Application
77917-01K .423" dia. Minimum line pressure for V8 applications
77917-471 .471" dia. Higher line pressure for towing and off-road
77917-500 .500" dia Maximum line pressure & shift feel for high performance applications

Learn More About Zip Valve™ Drop-In Repairs
  • Valve
  • Sleeve .423" Dia.
  • O-Rings (2)
  • 200-4R, 4L60 TV Boost Valve Kit 77917-01K
  • 200-4R, 4L60 TV Boost Valve Kit 77917-01K