Well I say jack it up by the differential and put the jack stands under the bushing. Then move the trunk and see if anything moves... other then your two dead 80s era prostitutes
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Dave Morrison had it highlighted in his guide for w123 axle replacement which my indy had previously told me to jack the car up using a floor jack with.
Just make sure you chock the front wheels. When I did my axles I was so scared of the car rolling onto me I put my two wheel chocks in the back and these huge half pieces of wood in the front. I'm just petrified of my car falling onto me.