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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. 77917-500

.500" 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 77917-500 will eliminate these problems for a variety of applications, and will boost pressure higher than TV boost valve kit 77917-471 due to the increased .500" valve spool ratio.

  • Returns higher pressure than OE-ratio valve
  • 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 500