200-4R, 4L60

TV Boost Valve Kit
Part No. 77917-500

.500" Bore Dia., O-Ring Style

A common problem in GM 200-4R and 4L60 transmissions is burned bands and/or 3-4 clutches. This failure can be reduced by eliminating throttle boost oil leakage. The Sonnax drop-in TV boost valve kits [77917-01K] (.423" dia.), 77917-471 (.471" dia.) and 77917-500 (500" dia.) eliminate these problems for a variety of applications. For minimal line pressure in V8 applications, use Sonnax TV boost valve kit 77917-01K.

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
Drop-in Zip Valve™ parts install quickly and easily

Sonnax Part No.	Sleeve Dia.	Performance Application
[77917-01K]	.423" dia.	Minimum line pressure for V8 applications
77917-471	.471" dia.	Higher line pressure for towing and off-road
77917-500	.500" dia	Maximum line pressure & shift feel for high performance applications

Learn More About Zip Valve™ Drop-In Repairs

Contents

Valve
Sleeve
O-Rings (2)

Valve Body Layout

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.