Transmission Parts GM 4L80-E 4L85-E Valve Body Valve / Sleeve

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Symptoms:

TCC codes
TCC apply & release concerns
Converter shudder
Burnt converter

Cause:

TCC regulator valve bore wear allows loss of crucial apply pressure.

Correction:

Recover hydraulic control and renew TCC performance by installing Sonnax drop-in TCC regulator valve kit.

4L80-E, 4L85-E

TCC Regulator Valve Kit
Part No. 34994-01K

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GM vehicles equipped with 4L80-E and 4L85-E transmissions may exhibit problems such as TCC shudder, burnt converter linings, TCC apply and release concerns and related codes. These issues can often be caused by critical pressure loss due to excess wear in the TCC regulator bore. Installing Sonnax TCC regulator valve kit 34994-01K restores the hydraulic integrity of the TCC control circuit to return robust TCC operation.

Hardcoat anodized aluminum valve combats premature wear
Lengthened critical spool for added stability and wear prevention
Annular grooves help center valve in bore to reduce future side-load wear
Added chamfer to improve apply characteristics and prevent shudder
Two springs included in kit; one for OE lockup feel, the other provides firmer-than-OE
Drop-in Zip Valve^™ parts install quickly and easily

Learn More About Zip Valve™ Drop-In Repairs

Contents

Valve
Spring .420" O.D., Selective
Seal Scarf-Cut
Spring .300" O.D., Selective

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.