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According to my Local Tire Pro & extensive research: LT/245/75/R15 is the Largest Tire that will Fit on an 08 LS 4.2L I6 4X4 TB (or similar), Without Spacers.
That's what I'm running & they Do just Fit w/ No Rubbing or other Issues. But, I Do have a 2in. Lift. And, I do believe that they would fit without the Lift.
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