Wheel and tire question?
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Not a chance of those fitting on a stock truck. You'd need to be leveled at a minimum and do some trimming and deal with some rubbing. 4-6" lift would be better suited for those tires. A 35x12.50 is just too big for a stock height truck. The other problem is the wheels you got, with right at about 6" of backspacing the tires will be rubbing the frame and most likely the control arms. The wheels will work with tires closer to stock height though, but if you plan to level/lift to run those tires you'll most likely want to replace them.