Kit, Valve, Boost, .423" Diameter, 700-R4, 4L60, 200-4R, GM (82-93)

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.

Features & Benefits

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.