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There is such a thing as a case stretcher. I recalled seeing one in my Ford service manual for my '77 F150. In the picture, it's being used on a Dana 44 front axle. It looks like a simple tool that would be easy to make. It's basically a couple of upright bars that fasten to the axle housing, with a crossbar on the top and a turnbuckle on the bottom. The Ford part number is Tool-4000-D. Check with your local Ford dealer. They might be able to help.
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