Looking at the conversion for my truck listed below. I know I need the duallie hubs for the front axle and need to swap out the rear differential for a 3500 duallie. But on the rear bed, can I just add the factory duallie fender extensions to my existing short bed, like on the mega cab duallies?

 

You need to do a search! There are a couple guys on here looking to go the opposite way, and you could swap parts with them at no cost I bet.

One guy is even getting rid of his dually box for a flat bed. Good luck!!!

 

I don't think you have to swap the whole diff... You just need the DRW hubs if I remember right. Doing this you end up with the rear being about an inch narrower than a factory drw truck but as long as there is not tire rub you should be fine.

 

A new dually rear diff is needed. Dually hubs wont work unless mated to dually diff.

 

Yeah I was thinking wrong. Your right.

 

you can use your rear end but you will need the dually brake calipers, axle shafts as well as hub/bearings. pretty much, everything from the end of the axle tube out for the rear end to be switched over. i was thinking about converting mine over as well but i've had a hard time finding someone to swap parts in my area and plus i really don't need a drw...i just wanted it more for the stablility while towing.