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I recently bought a 95 7.3 f250 from a guy who says it was previously in service at a Fire Station, while I was flushing out my breaks because it has soft breaks, but that's another thread. I noticed on my rear axle it has wayyyyy longer studs then the front axle. So I started looking for axle information thinking I might have the ability to put make it drw instead of it being srw. Door sticker says the axle code is 39, but axle identification tag on differential says S122K. I looked up the info on S122K says its 3.55 10.25 NL and over 8500 GVW but that's not really answering the question of was this axle also used on factory dually trucks and do I have the ability to change it to dually. And no the truck is not 4x4
 

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No it wasn't used on dual wheel trucks.

Ford just gave you your money's worth with the extra length of the bolts.

The axle is a Ford/Sterling 10.25

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Usually longer bolts are accompanied by aluminum wheels

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...axle identification tag on differential says S122K.
Please try to provide first hand relevant help to members instead of posting outside links. Thanks.
 
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