I have read the threads on the dually conversion and have a good idea of what is involved, but I would like specifics so I can do this right, and do it only once. I will be building a flatbed for the truck so the bed and sides is a non issue.

I have my dad's old 91 d350 to take the parts from. Can I use the rear hub spacer along with the front and 5/8's lugs for the conversion? What all else would be needed? I can get the rims and tires from his as well. I would rather not swap axles as his has a bad axle seal on the passenger side that will not hold oil, even after repeated reairs.

So, with everything thats on his truck, what else would I need or will it be a complete swap over? Advice from the ones who have done this or any tips would be greatly appreciated, thanks.

 

No one?

 

I don't believe you can take the rear hubs and mount them on your D250 axle. Your spindles will be smaller. Unless you just want to go for aftermarket dually spacers, you may be stuck swapping axles.

 

The rear axle seal that you speak of seals to that hub so if it has chronic issues, the issues would carry over. That being said, they are different axles and different widths so your wheels would not be the right track width even if it was possible. The good news is, back then chevy and ford had the same bolt pattern and the axles are not corporate. So just get you a dually axle out of a chevy if need be. Just double check the width to make sure it is the same or real close to the same and check the location of the spring pads. worst case, just use the parts off of another axle to fix your. Another advantage to using chevy parts would be the elimination of the "coined" dually wheel style centering. Coined wheels are hard to center, harder to find, and almost impossible to find aftermarket these days

Bottom line, you want a dually axle and front hubs, it will make the conversion a lot smoother.

 

I can get the front hubs off the 91, so no problem there. I will start looking for a rear axle.

If the axle width makes such a difference how are people getting by with nothing more than a spacer addition in the rear on these conversions?

 

You can get by with the spacers on the rear, but be careful what you buy, the aluminum ones are junk and the cast ones are hard to find (so I hear). That being said, finding a dually axle would be the better way to go.

 

I'm pretty sure the axles are the same width. The flanges on the hubs are spaced different. The dually hubs fit on the single axle.

 

ya spacers are how you make a "Phantom" dually and they work because they are not as long as the hubs used on a dually rear end. They split the difference of a dually D70 and a single wheel D70

 

As far as the front goes parts can be pulled off the 91 donor truck correct? I'm assuming the front uses the coined rims as well?

 

correct, the fronts are also for coined wheels

 

Will non coined wheels work or is the hub only for the coined style?

 

What ever wheel you get would have to be lug nut centering because there is no hub lip to center the front wheels. My wheels have shanked nuts so the shanks center the wheel

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That would be the route i would go. Alcoa's would look nice.

 

I'm running eagle alloys witch use shouldered bolts

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