I have a Japanese mini truck, the rear diff is open unless in 4wd, when you engage 4WD it locks the axles, the little truck is unstoppable in the snow, a little interesting on ice but totally manageable, unfortunately their is not a lot of droop in the suspension so on rocks in low range it is real easy to crawl yourself over on to your side, fortunately the little truck weighs 1100 lbs and can be put right with a come-a-long in short order.

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