I just got mine done, and it went from feeling fine, to feeling sloppy, and now it wouldn't shift into 3rd on wide open throttle. I took it back and they told me to have the computer rechecked to make sure. They looked at the programming and nothing has changed. I got made and told the guy to look it over again. He had it for 7 days, and gave it back yesterday. Guess what the shifts even felt sloppier than before, and now all of a sudden on the freeway 3rd gear would not engage, and it made it hard to drive on the freeway. So I took it back to the shop and left it for the weekend, and he said he will drive it on monday. Before I got back to the shop 4th wouldn't engage. So I drove the Vette in second ten miles at 55 miles an hour back to the shop. I explained to the guy on the cell phone and he kept telling me that the shift kit had nothing to do with the 2 to 3 shift or the 3 to 4th shift. WTF does that have to do that it worked great before, and now it won't shift and I can't drive it. I am ready to bitch slap the guy. He is also the guy that invented a lot of the modern modifications for the 4l60e working with Art Carr. He even showed me magazine articles that featured him. Now I think the guy thinks that it is impossible that he could have made a mistake. I am very curios to hear from him on Monday to see what he has to say when he sees that it won't shift, but I am starting to have a feeling that somehow he is going to say that I burned out the clutches or something, and that this is my fault. I have not had my car for 2 weeks now, just to get a freaking Transgo shift kit put in.