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A 4wd transfer case is effectively a two-speed final drive, although it is used to produce crawling speeds for off-roading. I think the current Jeep Wrangler starts with a 2.7ish? reduction in ratios. Gear the axles so the 'Low' range is normal driving speeds, and the high range would be a set of overdrive gears. It is a locked transfer case, so no differential in it, so it could run just the rear axles if desired. Although I think one isn't supposed to switch high to low at more than 5 mph...
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