Product Description
Fits: 200-4R, 4L60
.471" Bore Dia., Factory Style Sleeve
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. Sonnax TV boost valve kits 77917-02K (.423" dia.), 77917-03K (.471" dia.) and 77917-04K (.500" dia.) eliminate these problems in a variety of applications. For V8 applications and higher line pressure for towing and off-road, use Sonnax TV boost valve kit 77917-03K.
- Throttle valve boost valve and sleeve are manufactured from hardened steel for better wear resistance
- Kits available in three sizes for .423", .471" and .500" diameters for a variety of applications
- Drop-in Zip Valve® parts install quickly and easily
| Sonnax Part No. | Sleeve Dia. | Performance Applications |
|---|---|---|
| 77917-02K | .423" dia. | Minimum line pressure for V6 applications and smaller vehicles |
| 77917-03K | .471" dia. | Higher line pressure for towing and off-road |
| 77917-04K | .500" dia. | Maximum line pressure and shift feel for high performance applications |
Symptoms
- Soft slide shifts
- 3-4 Clutch burned
- Reduced band life
Cause
MTV boost loss and insufficient line rise.
Correction
Sonnax drop-in TV boost valve kit prevents oil loss between the outside diameter of the TV sleeve and the pump body.
Contents
- Valve
- Sleeve
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.
GM 200-4R Valve Body Layout
GM 4L60 (700-R4) Valve Body Layout
