Ok, I bought the solinoid kit all three and replaced. Drove it for three weeks around town and no problems. I drove it on vacation 350 miles and along the way at highway speeds the check engine light came on along with the O/D light flashing,the trans temp light came on for like 30 along the way. Stopped and checked fluid and it was ok.The Truck seems to shift fine through all the gears. Any thoughts on this one?

Thanks