I had the opposite happen noticeably, I had the front end of the 84 off the ground for a week or so but when I dropped it back down the rear was still sagging like it wasn't unloaded. It came back somewhat but never all of the way.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k