Axle swap

Tony Shelton

BS Detector, Esquire
Any of you Ford guys know if this is an easy swap?

I've got a perfect running 96 f250 flatbed that I'd like to throw an F250 dually axle on.

The junkyard just got in a 91 F350 with very low miles that I can get the entire axle springs, wheels, tires and all. And the tires are pretty new, too.

Anybody know if that is an easy swap out?
 
First opinion . . .

if the '91 f350 is a pickup f350 and not a cab n chassis f350 then your looking at almost a direct bolt in.
the difference will be the '91 will be a short yoke.you can use your current drive shaft,but you'll need a conversion U joint and the u-joint straps of the donor rather than the u-joint u-bolt style your 2nd gen sterling has.


I (Tim) also think that dually has 3 1/2" wide shoes, SRW has 3". The dually may have had a larger diameter master cylinder bore and maybe power boost for brakes from power steering pump vs. Vacuum booster on 250.
 
Maybe it would be easier just to get spacers and the dually wheels.

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Measure the spring perch width on both rears. They will either be the same or else several inches off. If they are the same, it would be faster and probably cheaper to roll the new rear under the truck than fool with spacers and gathering up other parts.

There is a lot to be said for a dually rear as opposed to spacers when you actually load the truck. If you were just looking for stability for towing, as opposed to load carrying capacity, the spacers would accomplish that.

Yes, it is a bit of work. But well worth it if you load heavy..
 

No, probably not. For one thing, that u-joint is shown with cir-clips for retainers. You currently have a type of u-bolt (they are shaped as they sound) for retainers and the new rear will have straps (as pictured earlier in this thread)

I would go and take a picture of the different straps/bolts/clips but it's muddy as sin out there and I don't feel like wallowing in it right now.

Typically, a conversion u-joint has different size cup exteriors to meld the old with the new. Usually a full service Napa with a grey beard counter man would make short work of locating that u-joint.

Let me dig for you a bit.
 
I feel a bit like my dear departed bud, JT, what with answering all my own posts and stuff.

My guy tells me to start with;

"Carquest Part #2-3050 Rear of Rear Drive Shaft Conversion U-Joint & Moog #331-10 Yoke Strap Kit"

Of course, a quick google search then brings up several cross references.

Thanks for all your help Tim. I'm having second thoughts about doing it. I went to the yard today and looked at it.

It really didn't look to bad, but the guy who is going to take it off for me can't install it on my truck, so that means Chris and I will have to do it. Chris thinks it will be an alls day job.

If something goes wrong I can't spare the truck, coming up on February which is a heavy month.

Decisions, decisions!

Thank you again Tim. I really appreciate it. I still might do it, but I'm waffling now.
 
I agree with Chris, I think it would be an all day job if everything was to go smoothly and you didn't have to stop and run to the auto parts store for a bunch of stuff.
 
No doubt that the first one would be an all day job. The second one would only take six hours though. :)

The other side of that is that you already know your truck and it would cost more in registration and taxes to register another one and get it on the road than the rear swap would cost.

Tony, pm me your email so I can send you a pic.
 
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