Had a buddy with a Dodge van on which the rear end went out. Pinion seal went and he didn't know til it went "crunch crunch". He bought an 84 just for the rear end (had no motor/trans, seller was using it for a a shed) and I put it in for him, bolted right in, just had to use the axles and drums, from the original rear end.
Though these were 8-1/4s I was dealing with.