Axle Width

I am looking for info on making a 99 F-350 SRW into a DRW,
Some guys say i can put the dual wheels on my current axle, other say i cant cause the inside will rub the springs.
What is the difference in width bettween a srw and drw axle?
Is this possible with out any problems?
Do i have to buy a kit to do it? and If so where is the best place to find a kit like that?

Thanks
Shawn
Your best bet it to get a DRW axle and the bed unless your planning on running a flatbed.
I've posted on this subject several times if you want to do a search. My numbers are for the 87-97 10.25 rear axles, but I dont think there is any difference when comparing to the 10.5s.




