Differential ID numbers ?

[Geep]

I replaced the front Diff gasket today on my "new to me " 73 cj. When I took the ID tag off and cleaned the gunk and goo off of it , these numbers appeared 999431 47 11 4 27 . Anybody decipher these digits ?

 

[Jimbos76cj]

I think the first series of numbers is the BOM number. Second set is your ring gear (47) and your pinion (11) the next number is your gear ratio 4:27 if you divide the ring gear number by the pinion gear number that confirms the 4:27 gear ratio.

 

[Hedgehog]

There should also be a birth date on there somewhere. If you have a '73 jeep if it's a stock set of gears the date should be somewhere in '72.