The only spot I know of is the top of the frame above the right rear wheel...stamped in the frame should be the first 2 characters & then the serial #(last 5 or 6 characters). You may be able to fill in the other #s by description.
eg: 1st 2 characters J8=Jeep 1978
3rd character(transmission) a=auto,F=3ps,M=4spd
4th & 5th character(wheelbase) CJ5/DJ5=83
6th character(GVWR) A=3750
7th character(engine) A=258,E=232
followed by 6 digit serial #
Hope that helps.