Tire size problem
 

Well I have been running 285/70/17's with 17x9 Pro Comp 6059 with 4.625bs on my 2000 Silverado Z71 regular cab for about 3 months now. I have about less than 1/2 an inch before they rub though. It's now time to get new tires and I am going to get the Nitto Terra Grappler in a 285/70/17 also. With new tires there is no question its gonna rub like crazy. If I got just ford keys and cranked to level would these tires fit? I have stock suspension right now and somehow these have managed to fit,but my stock torsion bars are maxed just about. Any help is greatly appreciated.