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Vans are about 6" wider than the full size trucks, so the axle won't fit. Not sure about just swapping out the centre chunk, but that will be a major pain in the ***. It'll surely be easier to just change out the whole back end.
I had to pay $150 for a junkyard one about a month ago when my axles about fell out the housing (at least I found the source of the dreadful noise!). First junkyard wanted $300!