I don't have an AD truck... mines a 40 with a 71 Chevelle/Lemans width 10 bolt. I'm running a 255/70R15 on a 7inch wheel with a 3.76 backspace. I tried an 8 inch with 4.5 backspace on a 275/60R15 and it rubbed ever so slightly when the suspension cycled.
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1940 1/2-ton
Low skill and low buck build
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In the dark of night, she's a looker.