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The vacuum hubs have 2 rings that slide in and out of each other to engage/disengage.
Just put them in the engaged position (which you can do with your hand) and then weld the rings to each other within the vacuum hubs. Then just bolt it back on. No need to touch shafts or diffs...
It would achieve the same thing as SJ solid hubs but you won't need to source hubs or spacers.
