Ford 6R140 transmissions often display TCC-related concerns due to deterioration in the TCC apply regulator bore and boost assembly. As wear progresses, pressure loss causes various symptoms to arise such as TCC slip, no lockup, insufficient cooler or lube pressure, overheated fluid, suffering fuel economy and/or TCC codes. Restore normal TCC operation and restore cooler/lube flow by reconditioning the bore and installing Sonnax oversized TCC apply regulator and boost valve kit 126740-15K.

Hardcoat anodized aluminum valves combat premature wear
Sleeve manufactured from highly wear-resistant aluminum
Annular grooves help center valve in bore to reduce future side-load wear

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