i have been running the kem 345 tune for about 1k now, have not beat on it by any means. i get on it every now and then but nothing crazy. truck has 79k miles on it. first gear is a little firm which is ok, but 2nd and 3rd gear is terrible. it feels like they slip into gear and it jerks real bad. the other day i was taking off and when it got to 2nd gear it wouldnt go into gear i gave some throttle and nothing and i hesitated then gave a little more and it clunked into gear. any one know whats going on? truck shifted perfect before the tune.