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So I got a 94 f350 with 47's 4.5 inch backspacing and I forget what offset, anyway when I turn the wheel halfway the tires hit the leaf springs. Do you think 2.5 inch spacers will fix it?
Could you mock it up somehow? Put truck on stands, front tires off, turn wheel to full lock and hold the tire out so it doesn't rub... It would at least give you a starting point for spacer size.