Anyone know what these numbers mean on my diff cover?

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1989 R3500

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Location
Oklahoma City
First Name
Christian
Truck Year
1989
Truck Model
R3500
Engine Size
454
I'm guessing that the last set is the date of manufacture. But the rest have me wondering.

The only thing I can find is the 30809 number is obsolete, but it doesn't have which rear end it fits.
Thanks in advance.

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Nonstop

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Ca
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Nick
Truck Year
1985
Truck Model
K2500
Engine Size
454
Looks like it is off an 85-89 P300 UPS chassis with a 70HD. Thanks Billavista! Basically, it should fit most 60’s or 70’s.
 

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