Starting with a 2001 E350 V10 2wd sportsmobile high top. Purchased a 2003 E350 V10 with a quigley 4x4 under it and we did the swap from one van to another. Total swap took about 3 weeks could be faster if the parts had not been so rusted.
The high top as off a news van so it was super heavy duty but due to my time line I had to scrap that. Still have a rebuilt transmission for this ready for a transfer case to be attached. Also have some very nice stock rims and Michelin tires with only 1600 miles on them. That set is for sale for $650.