P0770/P0773 fault code at higher mileage due to failed 3-way lock-up solenoid on Toyota T100

Problem Description and Possible Solution
A code P0770 or P0773 may occur at higher mileages which indicates that the 3-way lock-up solenoid could be defective and may need replacement.
Problem Data
RepairPal Verified
Average mileage: 196,000 (196,000–196,000)
4 model years affected: 1995, 1996, 1997, 1998
6 people reported this problem
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After I reset the code p 0770, it will come back on cuising @ around 55 miles. The truck seems to run normal but I had trans fluid over heating a few time while towing a boat.