I would just get the Delphi injectors, thats what im going to get soon for mine. also if you have 4:10 gears(the dually i believe is a dana 60 which should have 4 :10) you can tow your house with that. if you dont have 4;10 gear 6 tons or so if need be maybe 8 but i wouldnt do it all the time unless you dont like your tranny or rear end. iv got a 93 f350 no duallys and it towed and 91 f 150 and a 94 dogde ram out of the mud in 2 wheel with no help from the other truck. did it no problem and its a 5 speed.