10.5 SuperDuty Rear Hubs to 8 on 6.5

Got4wd · Oct 19, 2011

Well I got tired of waiting for the custom hubs for my 10.5 conversion so I decided to experiment with the hubs. I have a few sets of hubs so I'm gonna play around with them some more. First I redrilled the 8 on 6.5 between the original 8 on 170 holes to get the OBS pattern. This is easy and doesn't cost much to do and the correct bolt pattern.

My next set of hubs should be done soon, hopefully in a week if I have the time to do them. With these hubs I plan on going thru the existing 8 on 170 holes, using a larger wheel stud and machine the stud down for the 9/16. I think this will be a "cleaner" way to do it but alot more time and money. Its really not needed as the dual pattern hub is plenty strong enough. The flange is 1/2 thick. Here are some pics of the work so far...

On this pic I went thru the one of the 8 on 170 holes and was almost able to use the stock wheel studs. Its close, but not close enough, so the larger knurled studs should work fine.

Here is a pic of how much the bolt pattern is off. Not much. (8 on 170 hub to the 8 on 6.5 rotor)

rusty1161 · Oct 19, 2011

Awesome!

Thanks.

Rusty

Hijo202 · Oct 19, 2011

Ok, this seems like very do-able plan, but, as with anything, what is the con for drilling the extra set of stud holes? Is it supposed to weaken the hub? There can't just be the pro, gotta have a con in there somewhere...

Got4wd · Oct 19, 2011

I'm not seeing one. I've seen dual patterns on much thinner axle flanges. Dynatrac, currie does it and I have ran them in the past with no issues

Bradbilt · Oct 19, 2011

Then what do you do about the rotor holes? Drill them too?

Got4wd · Oct 19, 2011

You run the E350 rotors. They are the same as the SuperDuty rear rotors except 8 on 6.5 pattern. The rotor pictured is a SD rear rotor. In the 3rd picture the rotor lines up with the new 8 on 6.5 pattern.

haddixj · Oct 19, 2011

Can you get 3.55 gears in the 10.5 axle? I dont think that was a factory option. I would be interested in this if I could get teh correct ratio

rusty1161 · Oct 19, 2011

They never came from the factory with 3.55's, but you could swap them in.

Rusty

Hijo202 · Oct 19, 2011

Won't the R&P from the 10.25 go into the 10.5? I also have the 3.55 gears and need to keep them!

Got4wd · Oct 19, 2011

Yep. You just need to use the 10.25 gear and bearings. It's what I did on mine.

redneckabbott · Oct 19, 2011

Very cool!

Got4wd · Oct 19, 2011

Also if you do a gear change you can keep your same yoke off of the 10.25. Although I just went to my local pick n pull yard and got one there for 6.00 bucks. And if you keep your eye on Craigslist you can pick up a 10.5 cheap. Mine was 75.00 bucks complete.

Alberta 7.3 · Oct 20, 2011

Would you be able to use the OBS or E-series hub on the 10.5" to avoid drilling? Just wondering if it's been attempted or done.

Got4wd · Oct 20, 2011

Nope. The obs has a super long spindle and the e250/350 is a Dana 60 spindle. Also too long. The SD spindle is very small, I'm pretty sure I have a pic I can post. I've even gone to the trouble to tear apart 14 bolts aam axles to see if I could get a hub to work.

JCart · Oct 21, 2011

Right on guys thanks for clearing up my questions....nuther item for the ever growing list.

jrc

rusty1161 · Nov 18, 2011

Any updates?

Thanks.

Rusty

Got4wd · Nov 18, 2011

The studs I am using finally shipped. Summit racing was taking their sweet time on this one. They will be here Monday hopefully and I can update the post when I get the new studs machined and the stock super duty holes redrilled.

rusty1161 · Nov 24, 2011

Got4wd said:
Well I got tired of waiting for the custom hubs for my 10.5 conversion so I decided to experiment with the hubs. I have a few sets of hubs so I'm gonna play around with them some more. First I redrilled the 8 on 6.5 between the original 8 on 170 holes to get the OBS pattern. This is easy and doesn't cost much to do and the correct bolt pattern.

My next set of hubs should be done soon, hopefully in a week if I have the time to do them. With these hubs I plan on going thru the existing 8 on 170 holes, using a larger wheel stud and machine the stud down for the 9/16. I think this will be a "cleaner" way to do it but alot more time and money. Its really not needed as the dual pattern hub is plenty strong enough. The flange is 1/2 thick. Here are some pics of the work so far...

Any updates?

How did you drill the bolt pattern? Do you have a mill or something like that?

Thanks.

Rusty
Rusty

On this pic I went thru the one of the 8 on 170 holes and was almost able to use the stock wheel studs. Its close, but not close enough, so the larger knurled studs should work fine.

Here is a pic of how much the bolt pattern is off. Not much. (8 on 170 hub to the 8 on 6.5 rotor)

Any updates?

How did you drill the bolt pattern? Do you have a mill or something like that?

Thanks.

Rusty

Got4wd · Nov 25, 2011

Friend of mine has a machine shop. He said it would cost 50.00 a hub normally to do a hub between the original holes. We are in the middle of machining the larger studs and maching the hubs for the larger knurled studs.

redneckabbott · Nov 25, 2011

Machine shop would be best unless you know what you're doing

not enoughsmoke · Nov 28, 2011

wanna buy matching fronts? with knuckles

fatsix · Nov 29, 2011

Don't get me wrong this is great info, but why do all of this and still run OBS rims? Do the SD rims not have the proper back spacing with the longer axles?

Got4wd · Nov 29, 2011

It doesn't really matter what wheels get used. Oem or aftermarket. Doing this to the hubs is just to get the 8 on 6.5 instead of the super duty pattern.

fatsix · Nov 30, 2011

Totally understandable. I misunderstood the post. I thought he was swapping to 05+ axles, then re drilling for obs bolt pattern, which made no sense to me. This is for the rear 99-04 10.5, and a hub re-drill for obs bolt pattern to get the stock gearing and brakes.

rusty1161 · Nov 30, 2011

Picked up the 95% complete 2001 10.5'' rearend. It needs the centersection rebuilt, but I feel better about doing that anyway. I am only missing the hub retaining nut for one side. Anyone have one laying around?

Now I am going to look into having the hubs machined for the 8x6.5 bolt pattern, lug studs, van rotors and have the center section rebuilt. This is a great thread.

Thanks.

Rusty

Got4wd · Nov 30, 2011

I might have one. They are unique to each side. Ones regular threads and the other reverse

weareweird69 · Nov 30, 2011

you can get a new one from ford.

rusty1161 · Nov 30, 2011

Thank you. I will start searching.

I already ordered OBS lug studs from Rock Auto. On clearance for $.60 each.

Rusty

Got4wd · Nov 30, 2011

That's not the ones you want unless your doing it from a way I don't know of.

rusty1161 · Nov 30, 2011

I plan on having the hubs drilled for the 8x6.5 bolt pattern and the holes sized to use stock studs. Is this a bad plan?

Thanks.

Rusty

Got4wd · Nov 30, 2011

They might be to long. I have a part number at home I can help you with. They were the best ones for going thru the center of the old holes

rusty1161 · Dec 1, 2011

The factory 10.5" lug studs are just shy of 3" long and they have that reinforcing web where they mount. The Rock Auto ones are 3-9/16" long. I see where there could be a problem. At least they were only $.60 each!

Thanks.

Rusty

Got4wd · Dec 1, 2011

They might be ok. The Obs studs are the same as the e250 e350 disc vans. If I remember right either they were too long for my stock van caps I wanted to use or the knurl was not in the right location. I have a ton of the Obs studs if you want those to save your money.

rusty1161 · Dec 1, 2011

Thank you for the offer. I ordered OBS studs already. I will keep an eye on your progress. I don't know when I will get this project done, still need to find a machine shop in my area and get the rearend rebuilt.

Thanks for all of the great info!

Rusty

DarkStarMedia · Dec 17, 2011

I have a line on a 05+ low mileage axle for cheap... what are the differences between the 99-04 and the 05+

I think it was mentioned earlier that the 05+ was 2 inches wider per side... anything else?

Richard

DarkStarMedia · Jul 26, 2012

BTW, I ended up getting a set of SD axles and the whole frame (including the ABS system and springs/mounts) for $350 + a little bit of barter. 87k miles on them from an 09...

Sorry... had to brag....

Am I right in assuming that this conversion will not work with the OBS 16" wheels due to brake/caliper size?

Richard

weareweird69 · Dec 17, 2011

That, and the brake rotor size.

Got4wd · Dec 27, 2011

Little update, played around with a test stud today. Need to make a few tweaks but it's going to work as planned. I'll post pics when they are all done.

10.5 SuperDuty Rear Hubs to 8 on 6.5

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