A body 8 1/4 rear end swap

if you're looking for a bigger rear to swap out an 7.25 or to go to big bolt pattern cheaply, your best bet is an 8.25" out of an XJ jeep cherokee. it's about the right width for a duster (about 60"), and the most common gear ratio is 3.55 (what autos came with). you can occasionally find 3.73's if it had a tow package or 3.07's if it had a manual. the spring perches are also 43.5" apart, although the spring goes over the axle, not under. most come with 9x2.5" brakes