So I am offer a guy i know on another mustang forum who has 4.10 gears and posi. I was wondering if this is a good idea or not. right at the moment, i do not know mileage yet, i have not seen the the items yet to see if they are good. and they are out of a ranger year unknown. but will work for mustang and ranger with the 7.5, or so im told. The seller has all the shims and wheels bearing for the 7.5 and they have the wheel bearings and shims. any inputs?