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How big of a tire are you trying to fit ? I don't wanna burst your bubble because mini tuba are cool as hell. But there isn't much room to be gained if you don't relocate the leaf springs as well.
Where are you planning to relocate the springs to, changing the axle position should be easy, but what year is this going to happen in, what size rear end? I'd love to do this as well but I'm stumped as to where i would relocate the springs to, and once thats outta the question theres still that large frame rail right there...