Is it ok to run 31s on my XJ for a a single 25mile trip to get to the garage where i'am putting my lift on without trimming?

 

Assuming you're not sagging it should be fine, but you'll want to unbolt the flares. You will rub at full turn though. Just go slow over speed bumps and the like and make wide turns and you're fine.

 

i had 31 on my 92 laredo it done fine unless you were turning sharp (rubs lower control arm) and dont go to fast on dipped roads. the tire will hit the top of wheel well. also depends how bad ur saggn

 

You will be fine. No wide turns and slow over rough terrain. 25 miles is nothin

 

Sag is pretty bad. I had bald 31s on and no rub but i figured full thread might

 

Should be okay, put one on and turn wheel to test, just in case.

 

If i unbolt the stock flares will they rebolt?

 

I ran my 31" TSLs for like 5 miles before cutting fenders. got hilarious looks in parking lots when turning as the big lugs banged on the front fender (very loudly)
After trimming, the rears rub a bit under hard flex, though the outer lugs on the rears are torn up enough that I don't really care that much.

 

I like the look your jeep has.