Loud noises banging over bumps
The acadia has two common problems for front end noises. You likely have worn lower control arm bushings. You will need both front lower control arm bushings. Also it is common for the struts to wear out from about 75k miles up. If they are leaking or have a harsh ride you should replace those as well.
SOURCE: 2002 gmc envoy front suspension noise
the clunking or rattle sound is actually coming from the end links on the anti sway bar. You won't hear it on the bumper test. Good luck.
SOURCE: Sorry my Truck is a GMC 2005 1500 Sierra, with loud banging in front end
check the sway bar end links they break off
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