i have a 95 xe v6 5 speed pathfinder with 235/75/r15 tires on it now i was wondering if i can fit 31x10.5 r15 tires on it with out a lift kit of any sort, and if not what is the biggest tire i can fit under there?

You're pretty much at your max now. You'll see rubbing if you go bigger. You could get Jeep coils or Ford F-150 coils in the bax and crank your T-bars up a little and fit 31s easy enough. I beleive the JGC coils are direct fits, the F-150 need to be cut.