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Re: Questions about frame and drive line
That looks to be a 73-87 frame. The 12 bolt was only axle until 1980 then 10 bolt became standard with 12 bolt as option. It would be safe to order everything for a 78 1/2 ton.
Have fun with your new project.
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1949 Five Window, 1973 Step Side, 2000 Z71
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