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I would think you would place the car on jack stands and use a floor jack under the rear end to adjust it to the location you want .

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Yep... thats all I would do
EDIT
re adjust the pinion angle also

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That is the way I do it, let the floor jack down so it is barely holding the rear end up to have a tiny bit of weight on the shocks, remove the bolts and either raise or lower the jack to the holes you want to us