I just noticed a new thunk noice (almost like droping a bolt in a plastic bucket) in the rear of the car. It only happens when I swerve the car back & forth in ether direction, even at slow speeds.

No evidence of the tires rubbing.
Stock springs and sway bar but with poly endlinks.
koni shocks
Edelbrock tubular panhard bar.
Stock arms with new 1LE bushings.
Torsen diff & 3.42 gears.
The rest is stock
Nothing been change for 3 months.

Any ideas?

 

I had a similar sound once, but it was because my spare tire wasn't secured in place. It would bump against the inside of it's housing, and really freaked me out.

Hopefully you have the same problem! It's a cheap fix. ; )

 

Nope, the tire was secure, but I tightened it up more and the sound is still there.

 

Check bolts on the panhard bar. I had the same noise, sounded like the rearend was screwed up and only when turning. Found the bar loose. It was about a month after I put it on also. I guess you just have to tighten them after a thousand miles or so after installation. Hope this helps.

 

Haven't been able to thoroughly check, but I did look and the bolts look ok. I put the panhard bar on a year ago so if it was going to loosen you'd think it would have done so long before now.

 

Try to tighten the bolts. They will look normal, and still be loose. I am pretty sure this is your problem. Keep us posted.

 

Check your end link to your sway bar on the rear-end. My friend's car did that and he had a broken end link on his sway bar.

 

Good call. One of the bolts was ~10 ft.lbs. light. Tightened it and regreased the fittings and took it for a test. No thunk.

Thanks

 

Good !! I knew it sounded like the same problem I had. Good Luck with it !!