I am looking at a 99 ford 350 single wheel. I want a dually, but can't find any.
The truck is 4 wheel drive. I am wondering if I can just mount dual wheels to the stock rear. Will they interfere with the springs?
Many of you are probably going to tell me to just buy a dually, but if the dual wheels will fit all I have to do is find wheels. I have a dually bed found and the local body man will repaint the dually bed to match the truck bed for my single wheel bed.
Any ideas if it will work?

 

I looked into that a few years ago but with a 2wd f350 srw. After talking to several people about it, it was just easier to get a dually. Suspension would need to be redone to accomadate the dual rear. I was also informed that I would need a heavier driveline and larger tanny cooler. On top of all that, the PCM would need to be recalibrated for the new rear end. I was looking at a 4:10 replacement. I do not know for sure how much of what I was told was BS or if friends were over compensating to be safe, but it was going to run into some money.

 

I do know that the duallys use a completely different rear end, which like empiretc said, will require different suspension too. It can be done, but it's going to cost some $$$.

 

All of the above - PLUS you won't be rated legally to haul any more than before you changed the truck from SRW - it will still be stuck with the SRW ratings!

And it's a 4x4 - dually's have different gear options than SRW - so you could have to re-gear the front....

I can't believe it would be cost effective thing to do!

 

The dually rear end is wider than the single. A few years ago I did the Arrowcraft kit on a 4x4 Ford I had. Looks cool but only recomended at standard axle rate. Theres a 3" spacer that bolts to your hubs, front and rear that have the new studs. The towing stability is much improved in the wind. Don't try following a single wheeler in the deep snow. The outside wheels have to cut a new trail. I've been sideways more than once!!

 

Thanks for the reply. I thought the newer rears were the same width. Dang the luck. I have done a conversion on a 1982 2wd. It wasn't as bad as I thought the except I used spacers on the rear instead of a rear swap because of frame width differences. I used the front spindles off of a 350 and they were a direct fit. I did this so that the front would split the rear tire tracks.
Well I guess it is back to the drawing board. I am just wanting to go with duals because of the road handling.

 

I know someone would chime in about the 4wd, since like I said, I was looking at doing a 2wd conversion. Sorry you got bad news, but at least you were ready for it. Just hold tight, next thing you know the PERFECT TRUCK will come along.

 

There is no reason you cant do the rears with a spacer and leave the front alone. You will need either 2 spares or be able to put the front spare on the rear. Have no idea what it would look like.
Depends on what you want. The issue with the gearing for a factory dually is not a concern for me.

I have a friend with a 99 dually 4x4 6 speed that he special ordered with 3.73's.

 

I just thought of another combo I saw. In the 70's they made the super camper special F350 with the extended wheel base. That was a great idea, those trucks had super single tires on the rear. Any way this guy bolted the dual on directly with 2" flairs screwed to the fender opening. It's not as wide as a factory dually. Looked awsome with the polished Alcoa's.