Plz explain the diff. between a 2500 and 3500 in regards to the axle and suspension. Im looking to put a flat bed on my ext cad 4x4 sb 2500HD but I want the added safety of the duel rear wheels and I want to convert this thing. So if any of you could point me in a direction that would be great.

The only difference I beleive is that the 3500 has an extra leaf in the rear springs. There may be one more difference tho that Im forgetting. Basically they are very similar tho.

--Ben

I knew about the overload spring. But I was wondering more about the brakes and studs(are they long enough) and wheels of course.

the brakes are the same IIRC