Looking at tires and rims for my truck . Probably putting in 2 in level kit . What size can I go up to with only the 6cyl (not eco-boost) motor ? It is a 4wd .Thanks in advance .

 

I wouldn't put any bigger diameter tires on it, unless you are going to do a gear sway as well. You could put wider tires on it. But the diameter increase will kill your low end power from a dead stop. You won't be able to pull as well, and it will struggle more to maintain speed in overdrive and such. I had a 2002 with a 4.6 on it and I changed the tire size from a 255/70R16 to a 265/70R16 and absolutely killed that truck as far as performance. I put true duals on it and a programmer and it didn't make a difference. It still sucked and I hated it.