Had cummins conversion, did like 8 tunes and not happy. Got a guy working on it now, it's not coming around. He is having me check line pressure next and said it could be the pcm going bad. This is a new transmission with maybe 10,000 miles on it. I wish I had some one to just give it to and get it back fixed. I called a really good tranny shop and he wanted nothing to do with it and he had owned one with a 12 valve in it.