.471" Dia., O-ring style

TV Boost Valve KitPart No. 77917-471 .471" Dia., O-ring style 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 Contents Valve Sleeve O-Rings (2)