Yes they are too big. They won't fit clearance-wise for one, and the axle on your truck really can't handle more then 31s. Not to mention you can't buy a 4 inch suspension lift, the only lifts readily available for your trucks are 3" body lifts and 3" and 2" suspension lifts. DO NOT buy a 3" suspension lift. If you lift the front more then 2" there will be no downplay in the suspension, which equals terrible ride quality among other issues.
Do you have a 4wd or 2wd?