Years ago I had a '78 Wagoneer. It just had the standard 4x4, both open diffs. It was pretty good off road but my buddy had an old Chevy 3/4 ton delivery van, 2x4 with a limited slip rear end. It was kind of like this pic. That limited slip would go places my 4x4 wouldn't go. Just having 1 locked axle made a big difference.

It originally had a 3-spd. After he burned out the 3d clutch hauling firewood, I talked him into putting a 4-spd in it. It only cost him about $100 more and he paid for it several times over in clutches.

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