re: 3.73 gears
I have that stock with 18" Sahara tires, 32s.
While I prefer this as a great all-round set up for my style use, I doubt it would be adequate for the kind of mods you are considering.
get in--buckle up--hang on
"soothing agricultural implement/personal servant/Walter Mitty multidimensional access utility device conveniently travels on pavement when necessary and often keeps me warm/cool/dry/soothed as needed."