this truck has all 3/4 ton suspension bolted up on it......then hebolted some 01+ front dually hubs to his 3/4 ton stuff.....it was good for 1 inch narrower than a stock dually up front.....he didnt wanna extend the control arms which you will have to doif you swap to 3/4 ton stuff.....it will be to narrow and wheels will hit frame if you dont.....out back this truck has a stock SRW 2500 rear outta a 98 model....you will either loose your inner fender wells and run a shorter rear or run stock inner fenders and a stock axle and widen your outter fenders....i can personally work with metal alot faster than fiberglass so we choose the shorter rear end