When you look at the numbers the second line gives the relevant information.
The 3 or 4 will be under the bolt head, and if the tag is in good enough shape you should be able to make out either a . or L to the left of the first two numbers.
. indicates open axle, .10 in your case
L indicates limited slip, L10 in your case.

10 would be 4.10 ratio
55 would be 3.55 ratio

Next three numbers 10 2 is 10.25" 97 and older with a 6.5" x 8 bolt circle
10 5 would be a 10.5" after 99 and have 170 mm x 8 bolt circle