I'm also running 275-60-15's with an 8" rim & 4.5" back spacing. The only mod that I did was put a 1/2" spacer in front of the front spring mount to center the wheel in the well.
As MRGTX stated the BFG's are by no means a performance tire but if you're just looking for a good street tire you really cant beat them for the money. They're quiet on the road and not too awful in the rain.
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