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Knocking in the rear
I've been hearing a knocking sound coming from the rear. Mostly the left rear, but today it seems like I heard it coming from the central rear area a couple of times. The noise occurred more today than the previous day.
I get the feeling it may be the sway bar, but I'm unsure. Visual inspection under the vehicle yielded nothing unusual. The sway bar bushings are intact. The sway bar links appear to be fine as well.
A few weeks go, for about two days, I heard a springy noise coming from the left rear. I thought something may have been loose in the trunk, but nothing was found. The noise went away. No idea if this is related.
Here are the facts I know about my rear end:
1) Hubs, bearings, and drums are original and have never been touched
2) All control arms are original
3) Struts, springs, etc and sway bar/links/bushings are new
It's always a possibility something has come loose. If this is the case, it could not be seen via a visual inspection with the vehicle on the ground.
On Monday, I may have an opportunity for someone to take a look under the car on a lift, with the wheels off. If this place does mechanical work, I will ask for them to take a look, or see if I can take a look myself.
Any ideas what can cause a noise like this? The sound is like a solid metal bar hitting something under the car.
2000 Toyota Camry LE (Japan made) i4 5S-FE 416,308+ miles.