GM 6L45, 6L50, 6L80, 6L90 units may have TCC apply and release problems. Bore wear or a stuck converter feed limit valve can result in converter overheat, incorrect TCC apply or release, inadequate lube and cooling, and converter over-pressurization. Reconditioning the bore and installing Sonnax oversized converter feed limit valve 104520-11 restores proper valve function, resulting in proper TCC apply and release, regaining control of lube and cooling.

Hardcoat anodized aluminum valve combats premature wear
Annular groove helps center the valve in bore

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