seems the 14 bolt drums and all move duals out farther than original drums so you can fit 16s,i have 52 1 ton ive stared at till i memorized most of it.truck is still at friends place.im thinkin of 14 bolt up grade for rear.i have 16" duals and a few tires to start hauling fire wood till piggy bank says i can aford to do what i want for rubber.good luck on whatever ya decide to do on your project