What axle ratio?

Is there someplace on the xj's that I can find out what the axle ratios on my 91 2 door 4wd 4.0l with automatic has? Also, where are the option codes on these vehicles located? Any help for a newbie is much appreciated!! Thanx, TT

3.55

Go to the dealer, give them your VIN number and they can run a build sheet. It will tell you all the info you need.