tire size ?
Yes, 33's fit easily. I think the largest you can clear with no rubbing are 285/65-20's (35x11.50). 35x12.50-20's will fit but they will rub the frame at full steering lock. You have to watch the width of the tires because of the deep backspacing on the OEM 20's.
These were taken at stock height with 305x55x20's (33.2x12.6) No rubbing but real close to the control arm's. Truck has been leveled 2 inches just for look's.






