Having a hard shift between 2nd and 3rd on 4R100 with 220,000 miles. Tranny has never been down, no other issues, 25,000 mile fluid changes. Plan to correct this issue by installing FTVB. Question to group is - I'm currently running the 1855 Flashpaq controller, so is this going to create a new issue between the two? We use the truck to carry a Lance slide in camper (close to 5,000 lb. fully stocked)!