Anyone know if I can get away with 33x12.50x20 on Ford factory 20" rims with a 2.5" auto spring and have no rubbing issues? Don't want to make the same mistake i did with my last truck and have to get spacers and trim a lot of plastic.
Thanks,

 

The 2010 year model and the current 2013 should provide the same clearance if they are both 4x4's and leveled the same height. Tires have to the same size and type. I ran 305x55x20's on my 2011 Lariat 4x4 on the stock wheels with no problems at stock height or after I leveled it out.

 

LT305x55x20 Nitto Terragrappler (33.2x12.6) on stock wheels. This was on my 2011 Lariat 4x4

 

According to that then I should be good. Just wanted to make sure I didn't have to trim and or get spacers. That was a PITA!
Thanks,

 

With the deep backspacing on the factory 20's a 12.5 inch wide tire will be real close to the upper control arm. If you stick with an all terrain tire you'll have more clearance then with mud terrains with large sidelugs.