Alright, i already know that this isnt the best thing to do for the tranny. Im going to the strip next Fri, and this will probably be the last time i go this year. My best is a 15.06. And thats from just sticking it in OD and flooring it. I know that doing the shuffle will help me out a lot when it comes to my tranny shifting. At the track its shifting at like 4900rpm, which is really killing me, that and the 2.73s out back. Im only doing the suffle 1 time, so hopefully everything will be ok. I just got the Transgo kit and will be installing that along with my 4.10s this winter, so i wont have to worry about the 1d1 shuffle anymore. I was just wondering what kind of difference it makes, how many tenths will it shave off? Ive heard 3 to 5 tenths, is that correct???? I tried it last night, and it is a noticeable difference. Just wondered if any of you have any experience in it