Sonnax TCC Apply Valve Kit (Only PWM Units) 4L60E 4L65E 4L70E

Sonnax TCC Apply Valve Kit for 4L60E, 4L65E, 4L70E (PWM Units Only) GM 4L60-E, 4L65-E, and 4L70-E transmissions with PWM units often experience converter overheat lockup issues, including no lockup or premature lockup after 2nd gear when the fluid warms up. These problems are typically caused by valve bore wear and oil cross-leaks. Sonnax TCC Apply Valve Kit 77805E-K resolves these issues with an updated design featuring a PTFE seal to eliminate cross-leakage and ensure proper TCC operation. Features: Eliminates TCC drift on apply with updated stroke pressure PTFE seal prevents cross-leaking of converter signal and feed oil Works in both early- and late-style PWM pumps (spring included) Drop-in Zip Valve™ parts for quick and easy installation Contents: Aluminum valve PTFE seal Spring Symptoms: No lockup Code 894, 1870 Falls out of lockup when hot Fluid blown out of the fill tube Lockup immediately after 2nd gear Cause: Excessive pump bore-to-valve clearance allows TCC signal oil