ok, so if you calculate high range, your old tire size is 30 and new tire size is 38, old ratio is 4.2, all you need to keep the same 'feel' is a ratio of 5.3 which is a little higher than 4.9 which is what you can put in but it isn't that far off and when it really counts is when you are fourwheeling which you can then use low range and be better off than you were stock.

97 Montero SR w/Mitsu Adj Shocks & Rear Diff Lock ARB Front Diff Lock 4.9 Ring/Pinion 3.15 transfer box 43:1 crawl ratio 2" suspen lift 2" body lift 2" Gas Tank Lift 35x12.5 MTRs 15x10 Wheels Rock Sliderz ARB front bumper w/12k winch Custom rear bumper