i know they should pretty well bolt right in,however what about the axel lenghts,and brakes?? can i simply buy one of these complete units,and bolt it in and everything else like ebrake cables,and wheels all work just fine??? i have to buy wheels anyways,so needing a different backspacing isnt to much of a problem,however if i cant get some decent looking wheels because of the backspacing i would need,i will just go with a ford 9",what is your guys take??? thanks