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

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 reconditioning the bore and installing Sonnax oversized TCC regulator valve kit.

4L80-E, 4L85-E

Oversized TCC Regulator Valve Kit
Part No. 34994-18K

Tooling:

F-34994-TL18
VB-FIX

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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. Reconditioning the bore and installing Sonnax oversized TCC regulator valve kit 34994-18K restores 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
Selective springs; one for OE lockup feel, the other provides firmer-than-OE

Contents

Valve
Sleeve
Spring Long, Selective
Spring Short, Selective
Retaining Pin

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.