You should have 4.1X stock but if you aren't the original owner it could have been swapped. The only way to know for sure is count teeth on the gears or spin the input and check the output.
(if you are having a shop do work on the axle let them buy the correct parts, if looking for a used axle 4.1X is probably what you need but I'd personally check it before spending money)
With the numbers on that differential I agree that 4.11s are almost a definite...
I have heard of rare occasions where there were 4.56s with the 4 cylinder....
To add....if you don't know the history of the Jeep...I'd make sure...
If you know they've never been messed with....
they are 101% 4.10's on your platform