What's a good rear end to put in my Duster?

What's a good rear end to put in my Duster? Yours

Obviously some rear ends are more desirable than others. There is more aftermarket support for the Mopar 8.75 than the 8¼. The 8.75 was available in three different configurations characterized by the differences among the pinions and carriers. There are also differences in Sure Grip units. Early SGs used clutch plates, later ones used a cone clutch to control wheel spin. The early SGs are re-buildable, the later ones not.

http://www.moparts.org/Tech/Archive/axle/16.html

If you're not a purist about keeping the car all Mopar, you may want to browse the Ford aisle at the salvage yard. The A-body has spring perches that are 43" apart. Well, all Mavericks, the 64-66 Falcons and Mustangs do, too. So do the leaf sprung Monarchs and Grenadas. The holy grail of Ford pieces is the rear end of the Lincoln Versailles which is prized for its disk brake set up.

Remember, while there are a number of rear ends that will work, fewer will provide the desired results and make you look like a genius, too.