Exactly, that's why I was trying to avoid that so I don't have to re-gear. It's really looking like I may just need to order a new cab & chassis. Now it's a debate between a 350/450/550. 350 would allow me to order an SRW, the 450 and 550 would allow for super singles. Not sure which route to go there and then I need to decide between the 7.3 gas and the 6.7 diesel.

 

Yeah and at 176K I wouldn’t be investing a bunch into it.

No idea your needs but I would probably do a 450 pickup since the 6.7 isn’t derated. Changing the bed anyway? You also aren’t over 14,000gvwr.

You can also do a 7.3 15,000 derate f450 chassis cab

 

What do you mean by the 6.7 isn't derated? Yeah, not needing the bed makes a cab/chassis build makes sense.

 

C&C trucks get derated engines, not as powerful as pickups.

 

I thought the DRW used a 200 mm bolt circle, compared to 170 on the SRW.

 

The gas is the same mechanically but the diesel is different. C&C vs pickup.

 

Something to consider on the 450 & 550 CC is insurance, those are considered commercial vehicles, the RV part is the twist.

Buying one off the lot as a registered RV vs buying one and converting might be a lot of hoops to jump through.

 

I hear ya there. This will be a flatbed camper that can be removed. So it won’t be an actual RV. I do need to research the insurance aspect though.

 

If you're willing to buy a new C&C dually and put super singles on it, why can't you just put the super singles on your existing dually that you said in your initial post you wanted to keep and call it a day? I'm sure you've already considered it but I'm curious to know why that wouldn't work.

 

You can’t put super singles on an f-350. That’s the whole point. I was trying to find a way to convert a 350 to SRW’s without major work such as replacing the entire rear end which then causes me to re-gear. All of this on a truck with 176k miles. With the costs of used trucks and the fact that you can order a C&C in both 350’s and 450/550’s, the rules change. A 350 SRW C&C or a 450/550 with a super single conversion are the two viable options at this point. I didn’t want to spend that much, but I also don’t want to dump too much in a truck with this many miles. Make sense?

 

Sterling 10.5" has 4.11 gears available. Find a Sterling 10.5" from 2011+. 2011+ went to a 37 spline pinion from a 31 spline I believe. They had E-lockers available from the factory. There is no gear split with the E-locker so you can throw whatever gear ratio you want in.

 

Take 350 DRW to local dealer. Trade it in an pick up a F350 SRW. That is going to be the least work involved.

 

Problem is you max rear gawr at like 7200lbs in a srw 350. You could change wheels and tires and get a little over 8,000 but that won’t match the sticker.


Do a 450 pickup if you want a diesel and can live with 10,000 rear gawr on the white sticker. Keeps you at 14,000 gvwr too. Typical lift kit parts too. Offset the mods by selling the factory bed and wheels. But you do loose about 1ft in bed length but make up for more than that in width.


There are tires out there that work with super single set ups and have 87mph ratings.

 

So if I went with a cab & chassis and just bit the bullet with the super single conversion in a 6.7L...would you go F-450 or F-550, and why? I like the idea the a C&C will be discounted probably more than I could sell a bed for. The detuned engine doesn't bother me too much as I could get that adjusted when making the 6.7L the way it's meant to be. Not to sure how I feel about the smaller turbo, not because I'm hot rodding, but because I'd rather operate at 1/2 of full size than 3/4 of a smaller version. Either way, the point is, 450 or 550 and why?

 

Why is that? Isn't it just changing out the dual rear wheels to a single wide wheel?