It sounds as if you are east of Parker with your reference to Tom's shop. I have a friend that works on mainly cummins and 7.3 powerstrokes. He is just the other side of Delbert Road, does fantastic work and tends to be a fair amount cheaper than most other shops. I am more than happy to PM you his information if you would like it. He is a very honest and straight forward guy that will not give you the run around on things.