[kwmech]

Even 33s with a 4.56 will be fine. I had a 1990 suburban years ago that I had put in 4.56 gearing with 31'' tires, and the 700 ... best change I ever made. You got to remember when the trans shifts into 4th and locks up the convertor you are reducing the effective ratio by almost a third. So your 4.56 becomes just around a 3.2 ratio final drive. Stick with the 4.56