Duster rear end swap???

Depending on the year yes, it should have a 8 1/4 some even have suregrips (posi traction) BUT it will be to long for the duster, and will definitely not be worth cutting down. If It has a suregrip, you could always swap it over to a easily obtainable A body 8 1/4 that will bolt right in. Now again there is a BIG but, if the car is mid 95 or newer it will have whats called 29 spline reared and nothing will interchange with a old A body 8 1/4 because they are 27 spline. Also the later Jeeps have coilover suspension that would have the be dealt with. BUT then again the rear end may have disc breaks on it and if that's the case they can be swapped out onto a A body 8 1/4 with little work. I think I covered everything.