Make sure that everything (jack, tire, etc) is bolted down well in the trunk first. </P>
Then jack up rear of car (use a 24" or so 2X4 on the rear cross member (uni-body part with 4 "tubes" connected to it). Put jack stands under 2X4. </P>
Suspension is now at full droop and can be played with till you find your culprit. Taking the tires off will help to access the top suspension components. Check for dry rotted rubber, loose hardware, etc. Get a friend to help if your at all uncertain.</P>
Neon friends in all areas can be found at:</P>
http://www.neons.org/forums/</P>
go to the bottom for regional info. </P>
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