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Old 12-30-2010, 05:57 PM
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Rear axle swap - tips for you

I'm in the process of swapping my rear end. Here's some tips so you don't make the same mistakes:

I checked the tag on the rear end and got the number.

I then used this chart: Ford Rear Axle Assembly Identification - Page 13 - FORDification.com

I have a S409-H tag which is the Ford F250SD, F350SD Pickup 00-01 3.73 10.50 LSD.

I got a junkyard special with the S461-H tag which is the Ford F350SD Pickup 00-01 3.73 10.50 LSD.

They looks like they'll both work right? Not quite.


Tip 1: Measure back plate to back plate to ensure they are both the same width. These just happened to both be 60".

Tip 2: Measure back plate to the leaf spring plate on both sides. My original ones were 40" inside to inside. The new rear end was 38" inside to inside. We are now grinding off the welds and re-welding them to the tubes further out.

I'll update as we get it swapped out.
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Old 12-30-2010, 08:35 PM
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Sounds like your new rear end came out of a cab and chassis model.
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Old 12-31-2010, 03:17 AM
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Mine is an extended cab. This was not and had a service body on it. Used to be a Pike electric truck.
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Old 12-31-2010, 09:42 AM
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The cab chassis model has a narrower frame in the rear and comes without a bed.
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Old 12-31-2010, 03:02 PM
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They explained to me what a cab and chassis truck was today at the shop. I had it all wrong as you can see.

You hit the nail on the head though. We cut them off and rewelded them back on and all is good for now!
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