It's on ohios BMV website. I was looking for "legal" exhaust mods, there aren't any. If you change the muffler to something other than stock you've violated an ohio law, how stupid... I'm moving back to indiana where you can run open headers as long as it's not 10pm.
I don't think the issue is tire size as long as they are DOT approved......lift law is what you want to watch. I know some tall trucks in Ohio, but if your raising cane and the eye of the Police, your sure to get stopped.
5,000 lbs. or less GVWR 24" front 26" rear
5,001 lbs.-7,000 lbs. GVWR 27" front 29" rear
7,001 lbs.-9,000 lbs. GVWR 28" front 30" rear
9,001 lbs.-11,000 lbs. GVWR 30" front 30" rear
from frame or factory bumper
(which ever is higher)