if its from a 2wd van like you say it should already be 5x4.5 I don't think they changed to 5x5.5 on 2wd vans and trucks til '85 only 4wd's had the 5x5.5 pre 1985
the only thing is you are going to spend a ton getting new axles/getting them cut and getting the axle tube cut as well as new gears I think I would have passed on that one
