I GOT AN 87 cherokee and i can get 31 10.5 tires from a friend for real cheap and i was wondering if they will fit on my jeep with out rubbing and if it rubs how much will it rub

Yes they will rub, you could try trimming the fenders, but I would recommend going to a 3" lift first . to give you the adiqate room for axle articulation.

how much do u think it is goin to run me
to lift it

NOt sure, I would HIGHLY recommend Rubicon Express to purchase your lift. Stay far away from 4 Wheel Drive.com. Check out the thread under Chevrolet, Sliverado.

you can squeeze them on with a $200 2" lift but they might rub if you take your swaybar off and go 4wheelin'