Originally Posted by 1337Taco
This is when I had 285/75/16's on my truck before I had the All-Pro leafpack and I wasn't able to hit my fender at all. I always had around 1/2" of clearance all around. You could always bump it so it doesn't ever have a chance of hitting if you want. When I upgraded to 315/75/16's with the All-Pro's and new bumps I wasn't able to hit fender either.
285/75R16s are almost universally smaller than 285/70R17s. Once you get close in fitting or not, the tire size becomes critical.
Since the leaf pack determines axle location fore/aft, different leaf packs will rub or not in front of wheel well, for a given tire size. AllPro
seems to space the axle more rearward, to match the lift height. The factory leaf and TSB leaf do not.
Wheel back spacing and width also effects rubbing. An 8" wheel with 4.5" backspace wil move the wheel in .5" compared to a 9" 4.5" BS wheel and thus reduce rubbing.
Since the leaf pack thickness (along with any and everything over the axle like a Ubolt flip plate) determines bump height (if mounted to top of pack) or bump travel (if mounted to frame) and thus the amount of up travel you have available. A thicker leaf, like the AllPro, will allow less compression vs. a very thin leaf like TSB + Icon - overload, becaue of this (unless you have some alternate bump set up). Most people willling to spend the money on glass and 34" tires are not going to be wanting to throw away their wheel travel by simply extending their bump stops. Maximizing up travel is just as important as maximizing down travel, especially in trucks like ours, with limited articulation. Of course glass solves 99% of all fitting problems in the rear.