- 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.
TV Boost Valve Kit
- Boost Valve
- Boost Sleeve
- O-Rings (2)
.423" Dia., O-Ring style
A common problem in 4L60 transmissions is burned bands and/or 3-4 clutches. This failure can be reduced by eliminating throttle boost oil leakage. The Sonnax replacement assemblies 77917-01K (.423" diameter), 77917-471 (.471" diameter) and 77917-500 (500" diameter) eliminate these problems for a variety of applications.
- 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.