Minor suspension problem after mountain run.

[ghostuss]

Well tonight after I got home from some mountain driving I realized some problem with the suspension. It might have being there before but I just realized it now. Like If I push down the rear and let it go, it will come up really fast and when it gets to the top it would like make a squeek sound and continue to make that sound for around 3 seconds. I am not 100% sure but it feels like the last part of the height recovery was very slow or it might just be my imagination. Is there something wrong? I have had bushing problem for awhile I know I need new bushings but could this be the helper spring or something like such?
Also, so far I got ST front and rear Sway bars and coilovers. What would be my next suspension mod that I can benefit the most from?

[Jung918]

I am guessing that your shocks are gone.

[sykikchimp]

what kind of coilovers? I can barely push my car down with mine..

[kingsol]

this is an old post, he already got new coilovers