There isn't any sure way to tell by measuring it. Whatever lift was put on there could have sagged, it could have been rearched, etc. Just figure out what size tire you want to run and buy the kit that makes it fit.
_____________________
John
95.5 YJ with "stuff"
http://SonsofThunder4x4.com
_____________________
John
95.5 YJ with "stuff"
http://SonsofThunder4x4.com