Transmission Parts GM 6L90 6L80 6L50 6L45 Valve Body Valve / Sleeve

Symptoms:

Code P0741, P0742
High TCC slip RPM
Overheated fluid
Failsafe mode
Harsh shifts
Harsh TCC apply
Loss of fuel economy

Cause:

Bore wear at the TCC regulator valve reduces TCC apply and converter charge pressure. A stuck TCC regulator valve causes either TCC slip or harsh apply.

Correction:

Ream to restore the bore and install Sonnax oversized TCC regulator valve kit to restore proper valve function.

6L45, 6L50, 6L80, 6L90

Oversized TCC Regulator Valve Kit
Part No. 104740-07K

Tooling:

F-104740-TL7
VB-FIX

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Vehicles with listed GM transmissions may have a number of TCC apply problems. Bore wear at the TCC regulator valve can cause no TCC apply or slipping on engagement, harsh shifts, loss of performance and fuel economy, and fluid overheat. If the valve is stuck in the apply position, the result is harsh TCC apply. If the valve is stuck in the release position, no TCC apply or TCC slip will result. Reconditioning the bore and installing Sonnax oversized TCC regulator valve kit 104740-07K will restore proper valve function, resulting in proper TCC apply.

Hardcoat anodized aluminum valve combats premature wear
Restores proper valve function and TCC apply

Contents

TCC Regulator Valve
Shuttle Valve
End Plug
Spring

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.