Took my truck in to shop. Was having flare ups between 3rd & 4th gear. All hydraulics are good and tranny pan & oil squeaky clean. Isnt throwing any codes on the elecrical. These guys have built trannys for years and have a great name. Said maybe valve body replace may help. Any one know what they might try? Have read here TPS noise may cause? They said same that 1 of the speed sensors could be problem.