I drive a 2012 Ram 2500, Cummins, 6 spd auto (68RFE), 3.73 gears. I am currently running 315/70/18 Toyo M/T's. From 33 to 35 to these (36), I've noticed very little change in anything other than the speedometer. My truck is deleted and has mild tuning. I've pulled 10K pounds with it with no issue. Only thing I do is to run it in Tow/Haul when I'm running around the mountains of Tennessee and North Carolina, just to help the tranny not shift so much. Can't speak to the chain issue, but 35's shouldn't be a problem for clearance on their own.
