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I've got a 71 short bed with a 6" lift. I bought it that way but it that way but it's got a custom drive shaft in the rear. I don't think that they can be lengthened so they build new ones. As for the driveshaft sizes, I'm not sure on the 73 and up but the 3/4 ton shafts on my year are bigger around and also the yokes and u joints are bigger.
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