Rear differential question - Ford Powerstroke Diesel Forum
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Old 06-03-2013, 02:53 PM
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Rear differential question

Gonna change front and rear diff fluids this weekend. Got the build sheet for my truck (2000 f350 7.3) this afternoon and it states that I have a 3.73 non-limited slip rear end. Now, when I pop the cover off is there a way to tell just by looking wether or not it is indeed a non limited slip? I was really hopin it was a LSD. My manual says to use 75w-140 for rear and 75w-90 for front. I found some royal purple gear oil with friction reducer already mixed in. What do y'all think of royal purple? Thanks for any help
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Old 06-03-2013, 03:02 PM
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yes, you can tell a difference by looking at them but i am not good enough at typing to tell you the difference. take a pic and post it up and somebody on here should be able to tell you. check your rear cover as they are bad about rusting through and leaking. i sanded and painted mine, alot of people go to the 08+ style. i feel that royal purple is overpriced and overrated but that is my opinion. i would suggest schaeffers or amsoil.
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Old 06-03-2013, 04:14 PM
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I'll try to post some pics. If anybody has any pics of the different differentials and can post em that would be sweet. I got to thinkin I know the manual says to use 75w-90 in the front, but why couldn't you use 75w-140??
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Old 06-03-2013, 04:29 PM
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this may help
you can spy the clutches on the pass side

http://www.fourdoorbronco.com/board/...c-lock-rebuild
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Old 06-03-2013, 05:16 PM
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Rp is junk from my experience. I either use amsoil or lucas for my diffs. Especially in the race car we use lucas diff fluid.
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Old 06-03-2013, 05:32 PM
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Amsoil in both my diffs and transfer case..

Sent from AutoGuide.com App
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Old 06-03-2013, 06:09 PM
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Cool I'll look into amsoil. I pulled some numbers off of the tag that hangs off the back of the differential. Maybe someone can decode it.

S-406 F
73 10 5 9M10
I just have a really hard time believing that there is no ls. The old rancher I bought it from (died last summer) had this truck custom built with all the options available for the year 2000. He was real particular in what he wanted and it just doesn't make sense that he would not have optted for a lsd. I'm gonna rip it apart this weekend and try to post some pics. FYI I looked for an axle code on the driver side door post and the axle code slot is blank. I was scratchin my head on that one
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Old 06-19-2013, 08:09 AM
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I used rp when I did my diff fluid with the fr mixed in. About a month later I ended up buying a bottle of fr from the dealership and putting it in there until it felt right on turns.
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Old 12-19-2013, 07:38 AM
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S406F is an open differential
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