Ok found it.
Seems to not go in as much detail as I remember (could just be that I read so many posts about this topic).
Found the below info here : Jeep YJ - Frequently Asked Questions (FAQ)
" What size of tires fit without rubbing?
Older YJ (sagged springs on stock rims with lots of miles) - 235/75r15
Newer YJ (non-sagged springs on stock rims with few miles) - 30x9.5r15
Newer YJ (non-sagged springs on non-stock rims with few miles) - 31x10.5r15
2.5" lift on stock rims - 32x10.5r15
4" lift on stock rims - 33x12.5r15
Backspacing on the standard rim is 3.5".
Stock height of Jeep to rocker panels - 18"
Wheelbase length of the YJ - 93.5"
Wheelbase width of the YJ - 57"
Ground clearance - 9"
Towing capacity - 1,000lbs with proper hitch (officially) - 2500lbs with proper hitch (un-officially) "
Hope this helps you out some.
I will look some more, but there is another sticky post that has pictures of readers rides with lift and tire combo's listed... I will post that too once I find it.