Looking to fit 315/75R16's on my TJ.  It has a Teraflex 3" suspension lift with 33" Trxus MTs now. What can I expect when I put the larger tires on. I want to maintain the current lift height, but still want the big tires.  Will I have to trim the fenders?  Anyone have a similar setup?  

I ran the 315's under a 2.5". It'll take some longer bumpstops.
with the sway bar disconected it can put the tire into the spring tower unless you have about 3.5" backspacing and will harmlessly rub the flares. Longer bumpstops are the key to keeping the tires from rubing the fender.
so..yeah, some triming will probably need to be done underneath where no one will notice without sticking their head in between the tire and fender.
also check out scramln's red tj with the half top..
heres my 2.5 with 34x12.5-16 TrXus....no triming here.. just bumpstops, my tires do touch the top of the fenders without the sway bar but just barely, nwith the sway bar, it just cant cause the sway bar wont let it flex that far.



 

Mud, I got a front bumper if you want it!  

Nice Jeep!  Thanks for the reply.  So on the road you don't have any problems?  Mine is a daily driver and I'm just as concerned about going down the highway as I am about plowing through mud.  

on the road is definately no problem, getting off road with the sway bar disconnected is where the problems with rubing start, keeping it low is a major  plus for on road handling. the larger/wider tires will give most a more stable feeling. in your case the tires are barely any taller than the 33" trXus are so you probably won't even notice any difference.

there's guys that have only 1" body lifts with 33's,.. if and when the stabilizer/sway bar is disconected then the suspension is allowed to flex enough to cause rub problems up front.

whats this?....ya don't like my custom bumper?!