Moving rear axle back

Like ToolmanMike said it doesn't affect the swing of that rear shackle that much, but it sure helps with adjusting for tire clearance against the front of the rear fender..
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Do you have a picture of the wheel placement in the wheel well?
That isnt a bad idea I wonder if it would be enough to keep from shortening my driveshaft. Thst would be a cheap alternative. And two birds one stone!