I thought all of the 3500s were duallies... Do you mean the 2500? I am pretty sure the dually has a lower gearing (maybe different axles too?) but I think they are basicly the same...
The duallys have a different rear end than a single wheel. Contact Trevor at Tennessee Wheel and Tire to find out what you need to run semi wheels. 931-962-4646
we had a customer want to do it on a ford, and it would cost a fortune with all the part swapping..... assuming its different parts like on the ford too....