2011 GT, 8.8 rear-end. Have 3:15's want to go 3:55 (or 3:31). Clutches and all that should be fine, car has 32,000km on it. Just want to drive in, drive out with new gears. I got the tuner. I don't trust my "capability" for rear-end gears. I did my 78 Bronco once, and the thing sounded like a freight train lol.