id check the differential out for sure, two differnt size tires on the back will create a negative effect on the diff. thats why they say if you get a flat in the back that you should always (instead of using a donut) put a front tire on the back (for non-staggered cars) and put the donut on the front. that would be my main concern, also like stated above i would pop the rear tire off and check to make sure that the smaller tire didnt create any friction burns on anything , nor did the front tire chew the front wheel well.
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