Originally Posted by ODAWG714
I'm running 4.30s and love em. You down in sd? If your near Anaheim you can try my truck with the 4.30s
And I believe the 325.60 is like a 36in tire I have two n my garage.
The 325/60/R18 is a 33" tire and is about 13" wide. You are probably thinking about the 326/65/R18, which is roughly a 35x12.5 tire. I used to run the 325/60's and have switched to the 305/55/R20 which is roughly the same dimensions but a touch more narrow (33x12). I'm also running 3.73 gears, but the cost to change them out is roughly $1k in new gears for front and rear and the master install kits, PLUS another $1k in labor to have them installed.
Since I tow, I am considering going to the 4.30's to help regain some of my mileage as well as gain some mechanical advantage pulling some of the steep grades with my toy hauler. Otherwise, I would be going the route with the 4.10's...
PS. It's going to take some serious fuel mileage increases to get your return on a $2k investment...