Looking to put a 5" lift in my truck and get a set of 35" tires. Currently have upper and lower struck spacers in the front and a block kit in the rear along with a 1.5" body lift. My tires are 34.4"x 11.4" currently and I'm going to upgrade to the 35s. Truck has 3.08 gears and I'm looking to either get 3.73 or 4.10 (opinions welcome), however the head tech at the Chevy dealer I bought my truck from said the computer may not allow it to work Bc there isn't a program out there from gm for that gear size so the truck may not work right after the gears are installed and that it may cost $2000-$3000 by the time they are installed with no guarantee the truck will work after. I'm not taking that as a answer Bc I have a hard time believing no body out there has changed gears in these. I have a diablo trinity programmer and wasn't sure if I swapped the gears and set the new gear ratio in the programmer if it will work so does my computer or anything in the truck need to be flashed?