Need help on rear end length and install.

[ShamrockCustoms]

you will not be able to fit more than a 10" wide wheel in the rear because of fender width. thecan get 3" wider fenders to help, or you can tub the bed some. if you have the wheels you want, use the fender lip to fender lip distance and measure back the distance of the wheels. this will let you know how much the tub needs to be. for the ford rear you need the offset of the wheel and then measure rom mounting point to mounting point. i hpoe i have said this correctly. hard to put in words.....