Yea the 2wd has the leaf springs under the axle. The 4x4s have the springs above the axle. It is an easy swap. Just simply put the axle on top. You will only need a spring purch. you can get them anywhere. Here is one.
http://store.summitracing.com/partde...p;autoview=skuYou will lift the rear somewhere around 5in. Measure your axle and springs and thats how tall it will lift it. If it is too high try add a leaf. air shocks. air bags. I just added a rams 2500 rear springs. When I did my 4x4 swap I keeped my 2wd axle so I had to do a spring over axle conversion. here is a pic.
[IMG]local://upfiles/70180/25134DC8E6C54BE1B87EF65C1FC1D217.jpg[/IMG]
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93 Dakota Was 2wd 5.2 NOW
4X4 5.9RT 33x12.5 6in lift 1/4mile 15.259 85mph over 1ml el 14.2 sea lv.
http://www.youtube.com/user/truck93 "No truck should ever be lowerd! NEVER"