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Super duty rear axle into a OBS with 8 on 6.5

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Old 01-26-2012, 12:00 AM
Got4wd Got4wd is offline
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Super duty rear axle into a OBS with 8 on 6.5

Posting here from another forum for you guys.


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. You can use off the shelf wheel studs if you do it this way.

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)

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Old 01-26-2012, 12:06 AM
Got4wd Got4wd is offline
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Here is where I machined the off the shelf wheel studs to the correct 9/16 for the obs pattern.







Left, off the shelf stud. Middle, machined stud, right, OEM F and E series stud.
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Old 01-26-2012, 12:10 AM
Got4wd Got4wd is offline
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So with this, you get a wider rear axle to match the front. Real disc brakes made for a 1 ton truck and a carrier that is stronger. And a parking brake that will work like it should.
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Old 01-26-2012, 08:45 AM
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Very nice! So this would allow you to use the 10.5 rear in an OBS with 8 on 6.5 wheels correct? And you're able to do it by machining out the hubs to fit the oversize studs and then installing the oversize studs into the machined hub.

If you could design a system that would allow someone to field modify(or essentially drill) out their own hubs without having to have them machined out with a mill and then install your custom studs, you could sell a lot of those studs. My guess is that it is tough to drill the hubs out to the correct spacing without having the hub clamped in place on a mill, even with the oversize holes. If there was a way that the average Joe could modify the hub with the use of a hand drill or even a drill press, you would have a VERY marketable product on your hands.

All that being the case, I think the best route for the average shade tree mechanic who doesn't have a full on machine shop at his disposal would be to do what you did in the first place there and just drill out their own holes in the hub. I'm also curious what the 8 on 6.5 rotor for the hubs you have pictured is from.
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Old 01-26-2012, 09:51 AM
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So what are you going to do for rotors, E series rotors I presume?
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Old 01-26-2012, 10:09 AM
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How about Van rotors. They are 8X6.5. Or even find a full van rear axle and do the swap.

I too would be interested in a set of those machined studs. Got a price for 16?
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Old 01-26-2012, 10:52 AM
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Quote:
Originally Posted by superduty4x4 View Post
So what are you going to do for rotors, E series rotors I presume?
Correct E350 rear rotors.
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Old 01-26-2012, 10:58 AM
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Originally Posted by Neal 97 250 View Post
How about Van rotors. They are 8X6.5. Or even find a full van rear axle and do the swap.

I too would be interested in a set of those machined studs. Got a price for 16?
The bolt company I work with is going to quote it out and I'll let you guys know what they would cost.
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Old 01-26-2012, 10:59 AM
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Quote:
Originally Posted by Neal 97 250 View Post
How about Van rotors. They are 8X6.5. Or even find a full van rear axle and do the swap.

I too would be interested in a set of those machined studs. Got a price for 16?
Will a van axle bolt up to a F250 or will you have to move the spring mounts ?
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Old 01-26-2012, 11:14 AM
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Will a van axle bolt up to a F250 or will you have to move the spring mounts ?
Couple things wrong with that axle.

Wrong spring perches
Offset pumpkin
Axle shafts not as strong
Smaller ring pinion (if I remember right)
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Old 01-26-2012, 11:21 AM
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Originally Posted by DIYMechanic View Post
Very nice! So this would allow you to use the 10.5 rear in an OBS with 8 on 6.5 wheels correct? And you're able to do it by machining out the hubs to fit the oversize studs and then installing the oversize studs into the machined hub.

If you could design a system that would allow someone to field modify(or essentially drill) out their own hubs without having to have them machined out with a mill and then install your custom studs, you could sell a lot of those studs. My guess is that it is tough to drill the hubs out to the correct spacing without having the hub clamped in place on a mill, even with the oversize holes. If there was a way that the average Joe could modify the hub with the use of a hand drill or even a drill press, you would have a VERY marketable product on your hands.

All that being the case, I think the best route for the average shade tree mechanic who doesn't have a full on machine shop at his disposal would be to do what you did in the first place there and just drill out their own holes in the hub. I'm also curious what the 8 on 6.5 rotor for the hubs you have pictured is from.
Your correct with the 10.5 to be used. I won't be getting involved in a "kit" to drill out your hubs. It's not worth the liability. And a local machine shop can do the hubs easier and drilled right. I may do a group buy and have the studs made if there is enough interest. Basically I was just showing how to do this so you can run the sd rear axle.
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Old 01-26-2012, 11:22 AM
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Can you buy just the hubs? I'm thinking rather than swap the whole axle a guy could swap hubs and run the van rotors to save on cost a little.
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Old 01-26-2012, 11:49 AM
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Q... what is the real upgrade here? i am not familiar with the differences between SD and OBS hubs.
Thanks for the info.
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Old 01-26-2012, 11:51 AM
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You get disc brakes and 3.73 gears
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Old 01-26-2012, 11:53 AM
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ooh, would be very nice
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