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Weird rear axle

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Old Aug 8, 2023 | 04:00 PM
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Weird rear axle

I've got an '04 F250 XL 4x4 with the 5.4 and 3.73 rears. The axle code is "C1", and the axle tag says "LS" along with the ratio. I had the diff cover off for an oil change, and it doesn't look like any limited slip I've ever seen. I didn't see any clutches or springs, and the spool (carrier) looked like an normal open diff. Weird. The truck had 17,000 miles when I bought it 14 years ago, so I doubt anyone changed it. It acts like a LS (mostly) on the road.

Am I missing something here? I should have taken a pic, but I didn't think about it at the time. I used to work at a truck gear shop many moons ago, we didn't see a lot of LS diffs, but the few I did see were obvious. I figured someone here would know what's up.
 
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Old Aug 9, 2023 | 01:25 PM
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I think the LS in those is a Trac-lok and it has clutches are under the side gears, so it looks kinda like a typical open carrier.
 
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Old Aug 9, 2023 | 02:00 PM
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Sterling 10.5 with a limited slip. Better than an open differential, but not by much.
 
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Old Aug 9, 2023 | 02:17 PM
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They do look similar and behave different upon inspection as illustrated in this video:



 
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