I have a 06 FX4 Supercrew, what is the biggest Nitto Terra Grappler I can fit without having to install a leveling kit? I have the 18's.

 

I'm not sure what exact sizes Nitto offers, but you can fit a 33x12.50-18.

 

Why not install a leveling kit? You can do it yourself for under $200 or have someone do it for about $300 (local shop price)! I just did it last week and love it! The stance is so much better than stock!

 

I agree with Wandell on the Nitto's, if you want to look at BFG's they make a 285x65x18 AT that will fit, this is a 33". I also agree it's well worth it to level your truck, make's a big difference.

 

a 325-60 will fit with slight rubbage but it also a 33-13.50

 

I have an '06 FX4 with a leveling kit on it. I recommend you put one on as well. You'll love it. I'm now saving up some extra $$$ to get some Nitto's as well!!!!

 

Unfortunately Nitto does not offer this size in a Terra Grappler.

As others have said though put a leveling kit on it and you can go a little bigger with no issues. I am probably going to go with Pro Comps myself because sizing issues with Nitto tires look like they will prevent me from getting the size I want.

 

But they do have a 33X11.50

 

They make a 285/65R18 which is about as close to 33x11.50 that they come in.

 

I am leary of using a leveling kit. Is it true that using a leveling kit speeds up ball joint wear? I also tow quite frequently will the leveling kit hurt towing?

 

You can always do a leveling kit and if it sags, do an add-a-leaf! It's kinda like a snowball effect!