Yeah, I'd drop a line (with the truck sitting level front-to-back) just to make sure. I just kind of eye-balled mine and 1.5" seemed to work. I'd say you'll be looking at 1.25 to 1.5". The dimension will also depend on your ride height (assuming you are trying to center the wheel at ride height).
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Jason - '67 GMC swb | '57 Bel-Air 4dr hardtop | '56 210 4dr Wagon | 2000 GMC Sierra
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