Originally Posted by FDBDW
Correct me if Im wrong but your 305/50/20 are 32" tall which is an inch shorter than stock but they are 12" wide vs. stock 10.82" wide , so it looks like the width is the problem. So you need to figure out if lifting the truck will alow the tire to clear whatever its rubbing. Maybe jack it up a couple inches and see if it clears, Ive never used spacers so I dont have any input on those. Either way I would suggest taking it to a 4 wheel shop or a good tire shop and get their opinion.
Width is definitely the issue as you stated due to the wider 12 or 12.5" tire.
Now that you mention it, when I put them on while the truck was jacked, the tire would spin freely with no rubbing.
Does a level actually change the location or angle of the upper control arm?
BTW, I appreciate your responses as I am new to the lifting world.