sand driving is better in h4, with bigger wider tyres you will smash the sand easily in H4, L4 is to torquey & tends to dig in more on the soft stuff, reduction gears are for L4 so have no affect in H4, as for reduction gears with twin lockers, I would go 45%, fit 85% if doing a lot of rock crawling, rock climbing, it will climb all day over any rocks, your fuel bill will go up a bit with the diff ratio changes but you will end up with a bullet proof truck that will do anything anytime, doesn't get better than that in my book
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