'62 Rambler differential question

[Justin Shelton <justinshelton@xxxxxxxxxxxxx>]

I brought home a '62 Rambler parts car and have begun
disassembling it.  The differential on the parts car
has a tag on it that says 13/41.

The car that I'm parting this one into (also a '62)
has a tag on its differential, but it says 9/37.

Are these tags gearing ratios?  If so, can anyone
explain them to me?

Both cars are 196s with 3 speed OD transmissions.

Thanks guys!

- Justin