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Need help with tag numbers from my rear differential.

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  #1  
Old 12-29-2008, 10:12 PM
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Need help with tag numbers from my rear differential.

Found the following numbers on my rear dif... Can you help me understand what they mean...


S 406 H
73 10 5 1H07
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Old 12-29-2008, 10:23 PM
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Without looking, I would say Sterling 10.5 with 3.73 gears.
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Old 12-29-2008, 10:24 PM
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You have a Ford (sterling) 10.5 rear end with 3.73 gears
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Old 12-29-2008, 10:24 PM
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I would have to agree offhand. Same sort of number scheme I have on mine.

Still slow!
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Old 12-29-2008, 10:29 PM
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Nice Chris. I am tired tonight and getting lazy I guess. Off to bed. Work today must have kicked my ****.
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Old 12-29-2008, 10:39 PM
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A little more detail:
If the codes on the rear differential tag were:
S409B
3L73 102 8C11

The break-down of these codes would be:
S409B:
S = Sterling Differential
409 = Print Number (Model Number)
B = Revision Identifier (Change in Design)
3L73:
3L73 = 3.73 Ratio
L = Limited Slip
Absence of L = Open Differential.
A 3.73 geared limited slip axle would be marked as : 3L73.
An open differential would show 3(space)73.
102 denotes the ring gear size. 10.25 inches.
8C11 is the build date.
8 = year of manufacture. In this case it means 1998.
C = month of manufacture. A= January, L= December so C= March
11 = day of manufacture. So the differential was manufactured on March 11,
1998
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Old 12-30-2008, 08:01 AM
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well... that sucks..

That explains alot. Now I know why I have one tire spinning all the time and not switching over to the tire that is not spinning.

I have been looking at installing some Eaton ELockers... Now I know that it will be huge improvement when I do finally get to do it.

Will the front diff have similar tags for identification?
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Old 12-30-2008, 10:52 AM
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Mine had a tag but I could not tell you what any of the info means off the top of my head.

Edit: That would be the info on the tag - I do not have info on the top of my head! lol
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Old 12-30-2008, 02:54 PM
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can work on the diffs be done w/o a press? ie: pressing bearings on and off?
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Old 12-30-2008, 03:04 PM
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forgot to mention ... there was another tag that read.. 75w140 syn only.

which of course is the oil type.... I think it is odd to find it says synthetic only.
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Old 12-30-2008, 07:13 PM
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Originally Posted by afonda View Post
forgot to mention ... there was another tag that read.. 75w140 syn only.

which of course is the oil type.... I think it is odd to find it says synthetic only.
I think it's odd that Ford believes the synthetic oil in the diff is good for the life of the diff. (have not seen or looked for that in writing, just what I've heard from several Ford dealers)

Of course, I guess it's all a matter of perspective. The motor oil that comes in the engine would also be good for the life of the engine if you just left it in there. You'd likely just end up with a very short life.
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Old 12-30-2008, 08:41 PM
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all i can tell ya is what it says bro'........

syn vs real ??????????

Maybe one day they will invent a real syn oil that goes 50K miles and only 2 oil changes per engine. (or diff) wouldnt that be cool!!!
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