cfr865

I'm getting 3:73 gears installed tomorow, I can't find how you change the gear set-up on the Sct2. The directions don't say much of anything. I have tried to find it but can't on the tuner, I'm afraid to push to many buttoms I don't want to erase my custom tune, or mess something else up. I also have the predator tuner could I use that for just the gear change only ? It's much simpiler to use and the directions are easy to follow. THANKS FOR ANY HELP.