31's or 32's with James Duff lift

Hi, I am not entirely new to the site just didn't post too much, but here is my question: I have enough money now and I am ready for a lift and tires. I'm going to order the James Duff lift tommorrow and the BFG T/A Ko's next week,which size should I go with 31 or 32? Will the 32's make my X go really slow or will I hardly notice it? Thanks

 

[AlaskanJack]

Well I watched and lended a hand when my buddy did his rear gears. It wasn't too awful difficult but yes a lot of info was needed

 

[Frodslhuz]

I don't think I'm handy or brave enough to do my own axle gear install.