The rear portion of the driveshaft is splined so not likely that the sub frame bushings are going to cause a problem with the steady bearing.

BTW it's bad enough that andrewwynn already claims himself to be a genius so reinforcing that usually results in a volcano of BS so I'm out.

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