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


MTV boost loss and insufficient line rise.


These replacement assemblies prevent oil loss between the outside diameter of the TV sleeve and the pump body.

200-4R, 4L60

TV Boost Valve Kit
Part No. 77917-471

.471" Dia., O-ring style

View Instructions

A common problem in GM 4L60 transmissions is burnt bands and/or 3-4 clutches. This failure can be reduced by eliminating throttle boost oil leakage. Sonnax TV boost valve kit 77917-471 will eliminate these problems for a variety of applications. For a higher pressure boost, use TV boost valve kit 77917-500.

  • Boost valve and sleeve are 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
  • Valve
  • Sleeve
  • O-Rings (2)
  • 77917 471