sorry if there's already a thread on this but I'm new to this performance stuff and have heard about getting a shift kit, I have it dynoed. I have a 2010 GMC sierra with the 4l60e tranny, I want some input on performance gains because I would like to run start running a 1/2 but it's a 4.8 and I don't have money to swap. would the HD2 fit a 2010 though also?