I am having problems with my tranny and am wondering if anyone has had a similar problem. I am running 35 inch tires but have adjusted my speedo to compensate with the Superchips Cortex. I am getting intermittent hard and awkward shifts, it's almost like its getting confused sometimes. I am wondering if there is some kind of sensor or control unit that might be haywire or if this thing is really blowing up on me. GM told me that they would diagnose the problem at a rate of $150/hr and once the issue was found they would determine weather or not it would be covered by warranty. I'm not about to take the chance that they spend 10 hrs figuring out that I need a new tranny and it isn't covered by warranty because it's something I did when I can just get a rebuilt for $1600 and through it in if thats the case. If any one can help me out with this it would be appreciated.

Thanks.