If i run 30s in the front and 31s in the rear will this hurt any aspect of my jeep? 4x4, handling, differentials,anything really?

 

it will play hell on your tcase for one.

 

To the best of my knowledge that will be extremely hard on your transfer case when 4x4 is engaged, likely resulting in a failure in the future

 

Beat me to it! Lol

 

Not a good thing to do... puts the drivetrain in a bind and could cause damage

 

Ok I have a question- why do you want to ride with different size tires?

 

Currently have 2 brand new bfg 30s n was given 2 31s even if i level it out with shackles n spacers the tires will matter?

 

Yes, your drive train has nothing to do with vehicle hight. The hight is just for like ground and tire Clarence. Leveling it out would make it look better besides the different size tires but you will still blow you tc.

 

yup what he said different size tires+4wd=blown transfercase.

 

Agreed, BUT if you are in deep mud all the time, while in 4wd it will be ok, but other then that, it will rip your transfer case apart. Not a good idea...

 

^ yes solid surfaces are the problem like rocks or pavement