I'm getting a van 14ff for the jeep and want to swap my current detriot into it. I also want to change gear ratios as I do it. whats cheaper money wise. swap my current 14ff into the burb with the current detriot and 4.10s and just buy a new detriot and some 488's or 513s for the van width one? or swap everything around just to keep the current detriot in the jeep?