35's/315's are pretty much the same thing, if anything 35's are just a tiny bit taller, and the 315's are slightly wider, but you should not notice the difference unless you have them side by side, i haven't have any side effects as a result of the tires being a bit wider, for example I went from 315 KO2's to 315 Nitto Trail Grapplers a few months ago, the Nittos are perhaps 1/4" taller which is nothing, but 3/4" wider than the KO2's, and my Jeep drives the same as before, i do feel the weight difference for sure though, and even more than that, the MPG loss, (2mpg less). No issues with the Jeep tracking the road crowns with 315's, and i still do 80-90mph with one hand without sweating, for instance, at 31psi:
I'm running a good amount of caster, 5.3-5.4* (also running an Adams 1310 front DS, i don't know if you can run this much caster on the stock DS, but i haven't have any issues so far in 2 years running it this way), and also my toe settings are bit on the max side, 0.16-0.17*, no issues so far with tires wearing down in a weird way, i have almost 5k on them, so it's time to rotate, and i'll keep my eyes on them like a hawk, if i start seeing toe abnormal wear, i'll have it realigned, but so far so good, this toe settings is something new i'm trying since i've the front lifted 1" a few months ago
Here is my alignment sheet, lifted 3" in the front, 2" in the back
by Wrangler RSM
, on Flickr
Hope it helps.