I would say definelty not lift on the diff. On a solid axle car the mounts can easily support the weight of the vehicle because they need to. With an independant rear suspension the diff mountings are designed to only support the diff and I think it is asking a lot to lift the entire vehicle with them.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)