I was able to change the differential fluid on my (unmodified) Z without jacking it up at all just by crawling far enough under it to reach the plugs. But I'm not a fatboy so it wasn't difficult. I did need jackstands to do the transmission fluid change. For that job I drove up on my Rhino ramps, jacked up the rear at the differential with a hockey puck on the cup modified floor jack, and then set jack stands at the proper points to level the car.
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