can i get a rear end from.....

has anyone ever taken a rear end from a Dakota or jeep and put it in an A-body?

I am interested in the 8 1/4 and I heard someone say that jeeps and Dakotas had the same 8 1/4 as older cars, so I started thinking that a shoebox Cherokee cant be much wider than a 68-70 B- body. plus the jeep or Durango probably has much better gears.

are there any major concerns to look out for....im looking for an 8 1/4 with somewhere around 3.23 to 3.55 gears (open or SG, don't matter) for a slant six Duster.