I was just wondering ifa rim that is 15x8 with 4 inch backspacing and a tire that is 275/60R15 would fit in the rear without any modification? If it wont then what is the widest possible without modification?
Thanks.

Yes.
You *might* have to hammer the inner fenderwell a smidge, but I didn't.

Did it give you any problems at all like, rubbing whil turning, or on a bumpy road?