Severe wear of the TCC priority valve bore caused by oscillation of the OE valve allows regulated secondary line and TCC signal pressure to leak to exhaust in listed Ford and GM 10-speed transmissions. This wear minimizes secondary line pressure control resulting in overheated fluid, loss of converter feed pressure, TCC release concerns, TCC slip code concerns and potential transmission control module (TCM) errors.

Reconditioning the bore and installing Sonnax oversized TCC priority valve kit 105740-22K eliminates the leakage of secondary line pressure by creating a new conditioned bore area for the upgraded valve to operate in. The O-ringed end plug provides a positive seal and prevents critical TCC signal fluid from leaking to exhaust. Both of these Sonnax features restore normal TCC operation by re-establishing the hydraulic integrity of this circuit.

• Hardcoat anodized aluminum valve combats premature wear
• Annular grooves help center valves in bore to reduce future side-load wear
• O-Ringed end plug provides positive seal to prevent critical TCC signal fluid from exhausting