if you jump to a 35 your going to need to extend your bump stops or trim your fenders. i put 12k on my jeep running 33s on a 2.5 in lift and it was great. got a great deal on tires so i upgraded.
mine with 33s and a 2.5 in lift
and it went places. granted i did hit my belly alot more than i wanted to but thats what skids are for right? now with this setup i could stuff all the tires with factory bump stops and i didnt rub on anything.
when i went to 35s slightly more backspacing
i was obviously going to rub alot
so i chopped the fenders. the rears im going to put 1in bump stop extension on but the front is fine
as far as gearing goes i do quite a bit of the spotting in my club and from my experiance 35s and 3.73 is a fine ratio. especially with the manual. first gear 4 lo with the rubicon t case is almost useless more often than not im in 2nd or 3rd.
use this if you want some numbers to look over http://www.grimmjeeper.com/gears.html
in the drop downs you want to use
transmisson = nsg370 close ratio
t case = np241
if you crunch those numbers rubicon tcase and 4.10 gears in 2nd gear is near identical to the sport tcase and 3.73 gears in first gear so 35s wouldnt be much of a hit
as far as crawl speeds go if your happy with the speeds the 33s crawl at then when you go to a 35 its only slightly faster at the same RPMs
and from my experiance spotting people with 3.73s and 35s they generally have plenty of torque to do 90% of what they run into and when they dont rpms can usually make up for it.
now ive also seen 3.21s run 35s and the amount of throttle they have to give it to overcome the lack of torque is just dangerous. i cant tell you how many times ive seen someone with poor gearing need to gas the hell out of something to get over some stuff and in the process shoot themselfs into a worse situation.