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Old 02-20-2011, 03:51 AM
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Rear Differential question

My old 94' F-250 has a limited slip rear end. It is fantastic for plowing. I am not convinced yet that my new 99 F-350 is the same. I have not driven it enough to be certain. Does anyone know, if it turns out to be a regular differential, if I can convert it over to a limited slip with just a gear change or do I have to replace the entire unit.

Thanks
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Old 02-20-2011, 05:44 AM
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Originally Posted by Kevin2011 View Post
My old 94' F-250 has a limited slip rear end. It is fantastic for plowing. I am not convinced yet that my new 99 F-350 is the same. I have not driven it enough to be certain. Does anyone know, if it turns out to be a regular differential, if I can convert it over to a limited slip with just a gear change or do I have to replace the entire unit.

Thanks
I could be wrong, but I do believe I read the 10.25" carrier will work in the 10.5", but not the other way around. If so swap the current ring onto the other carrier, reset all clearances/lash and plow away.

If I'm wrong on this, pretend I was never here! Someone smarter will chime in shortly.
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Old 02-20-2011, 08:11 AM
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Send a message via AIM to mustangman02232 Send a message via Yahoo to mustangman02232
if you have the money, put a detroit true trac in it
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Old 02-20-2011, 08:54 AM
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To change it over to limited slip you need to swap the center carrier for one that has the clutch packs in it.
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Old 02-22-2011, 07:36 AM
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I would opt for the ARB air locker or the Eaton E locker over the Detroit locker. That would allow you to turn it on an off as needed. Detroit's can be a bit of a nuisance on the street. Of course a clutch bases system like Ford's will be cheaper but doesn't lock up very well IMO.
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Old 03-05-2011, 06:23 PM
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The ARB and EATON lockers are NICE but they are exspensive . I would find a factory possi ford carrier . I think they are called trac loc
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Old 03-06-2011, 04:03 PM
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I noticed in the snow that both spin fairly easily. But on dry tar I was getting into traffic and nailed it to get out of the way and I spun out on 1 tire for a while. So I am still uncertain if I have posi.
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Old 03-06-2011, 04:07 PM
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Originally Posted by Kevin2011 View Post
I noticed in the snow that both spin fairly easily. But on dry tar I was getting into traffic and nailed it to get out of the way and I spun out on 1 tire for a while. So I am still uncertain if I have posi.
One wheel peel doesn't mean it's not a posi , could have worn cluch pack . Is there a tag on the rear end ? Otherwise pull the cover ant take a peek
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Old 03-06-2011, 04:12 PM
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Ok thanks I will check. umm er what would the tag say - "posi"??

And if I were to open it up (which I need to do to change the oil) what am I looking for to indicate it a posi?
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Old 03-06-2011, 04:28 PM
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Well my dana80 says ls . Don't know about the Sterlings . Well it will have the have clutch packs , I can't remember if you can see them without pulling the center section now that I think of it . If I remember correctly , if it's a posi . if you spin the passenger tire forward the drivers tire will turn forward as well , an open rear end the drivers tire will spin backwards .
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