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Friend of mine had an 85 3/4ton chevy 4x4. It came with 3.43s iirc. It could barely get out of its own way if you were towing and he towed a HUGE boat. Well he wanted to upgrade his weeny 10bolt/semifloating 14bolt axles to one ton stuff so I helped him find a dana 60 front and a full floating 14 bolt rear and swap them in. The new axles had 4.10 gears (most one ton stuff does). He could haul stuff much easier but his freeway mileage plummeted.
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