I do know that Gillette Diesel is around the Salt Lake area and they deal with Ats I believe or if you wanted to travel to West Haven which is by Ogden there is Baker's Diesel and they deal with Dtt. Both are performance shops that deal with transmission upgrades, if it were me I would travel to Baker's since I have had experience with them and they are top notch people to deal with and the gentleman who does the transmission installs will give you a ride in his truck (03 with juice, injectors, and BD twin turbos). If you want call Baker's and ask for Jason, he is the man in charge of the transmission's. Hope this helps Andrew.