Glove box sticker? Rear end ratio?

[1972]

Maybe someone can help me out on this. The above sticker (from another thread) shows RPO codes as I am used to seeing them. I want to know what the rear end ratio is in my '72 without taking off the cover, but it isn't listed on my sticker. And the numbers are different, like it says "1N4010" for power steering and "1LS910" for 350 CID V-8 engine etc... What's the deal with these numbers being different? And where can I find out what rear end is supposed to be in it?

Here is my sticker, sorry for the weird angle - the flash was causing a glare.