I had very squeeky and creaky suspension. it sounded BAD. Like metal scraping/creaking. New rear lower control arm bushes and full chassis grease got rid of all noises. any dry bushing in rear should be changed.

also check to see above and below the springs in front and rear. make sure the rubber shims are in good order and not touching metal.

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1968 280se Inline 6
Anthracite Grey - Socal