Ive been seeing alot of threads about tires and gears, i just installed 31's on my xj and i never even thought about my gears. Is it ok to run these tires with stock gears? sorry for the noob question

You should be fine. I ran 31's for about 2 1/2 years with stock gears an d I am still running them with my 32's til' I can regear. I had no problems with the 31's and stock gears.

You're fine at that size of tire!!

i run 31s and still have stock 3.55 gears. the only time i see problems is when i get in some real loose sand like a creek bottom or a sandy incline you have to get a pretty good run at it get the tires to spin good. i could use a regear but im really hard on my rig and it hardly ever breaks.

Stock gears will have there draw backs anytime you go to a larger tire. You will lose some power and not be able to go as fast and you could break if you wheeled it too hard. But I think you will be fine. I would go to 4.10's when you get some extra cash though.

stock gearing for 31's is fine, thats what i run. and there are steep hills everywhere here. if you go any higher than say 3.55 with 31's you'll end up topping out at like 50-60 on the highway, you'd be a stoplight assassin though. most people don't re-gear until about 33's. sometimes 32's.

You will be fine.

stoplight assasin lol that would be cool seeing with all the ricers around here. thanks guys

that is completely false.

Been runnin stock for two years now with 31's does fine i do want 4.56 and some 33's

really i have the stock gears with 33 on till i can regear and i can do 80 easy witch is more like 90 to 95 with the 33's so i think he will be ok till he has the loot to do it

had 3.55's with 31" mtrs...worked well, even did a rolling burnout one time haha. ive got 33's on the way and 4.56 (slightly deeper ratio than stock) gears...that will be going in once i get done ordering all my lift parts.

no problem cruising on the highway at 70 or 75.