I am looking to put bigger tires on my truck here pretty soon and don't know what to choose. I have factory 18' wheels and do not what to go too big where I might have to worry about rubbing. Any suggestions on size and brand?

 

I'd suggest a 285/65-18 (33x11.50) BFG AT KO or 285/60-18 (32x11.50) Nitto Terra Grappler. That will be about as big as you can go at stock height.

 

Sorry....forgot to add that I have a 2.5' autospring leveling kit.

 

You could easily fit 33x12.50's then. You could probably fit the new 305/70-18 (34x12.50) BFG AT KO's, but they would look pretty stuffed.

 

How do i go about re-calibrating my speedometer after getting the larger tires?

 

buy a tuner.

 

Dealership can adjust your speedo and shift points for you. They were going to charge me $80 to do this on my truck, but I went with an Xcal II & custom tunes instead.