You have the classic body style or new new body style?
Classic body style with leveling kit you can run 305s all day with minimum rubbing but new new body style you can forget that might be able to tuck 295s but I would stick with 285s the fender wells suck on these new trucks.
I have a pic of my dads duramax with leveling kit and 285s I'll try to dig up, I had to do some trimming and beating on his to make it not rub bad
|