i know this is stupid but at school i joined a tug war /club and i have a 4×4 97 suburban for best performance what button should i press….2wd, 4wd high,4wd high+ low—-the suburban weighs 3 tons also should i take it out of d and put it in 1,2,or 3 or leave it in [...]

I have 1999 Chevy Suburban 4×4 with no lift. Can I put tire size 285/75/R16 on it without modifications.