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A little more detail:
If the codes on the rear differential tag were:
3L73 102 8C11
The break-down of these codes would be:
S = Sterling Differential
409 = Print Number (Model Number)
B = Revision Identifier (Change in Design)
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,
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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