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Anybody have any other ideas of what could be causing a hollow thunking from the passenger side rear of my car when going over bumps? That's where it sounds like it's coming from,anyway.

I just had both of my rear shocks and upper shock mounts replaced on my '88GT because they had over 150,000 miles on them.

I have the Z51 swaybar with new bushings and am running 215 x 60 x 15's all way round. I had really hoped that the new shocks and mounts would've solved the problem but they didn't. I have a pretty decent amount of wheel gap on both sides and it's equal for each side. My trunk is empty too.

Is it possible that the rubber spring isolators have hardened with age and are causing this? I'm kind of stumped here. It kind of sounds like my old Camaro SS350 did when I'd go over bumps with too much air in the old airshocks. Any suggestions on what else to look at would be appreciated.

Scanman88GT

Hi..new here btw;

Although it may sound like it is coming from the rear, have you checked your lower control arm bushings? They are notorious for going bad.

No, I haven't.

When i go over bumps or train tracks for example, I can hear seperate noise from the front and the rear. This hollow sounding thunking noise is definitely coming from the back end. I was thinking maybe rear axle bushings or something of that order.

I'm going to have my local GM dealer just kind of go over the whole car and give me a write-up on the overall condition of my whole suspension as well as anything else I need to be taking care of. I figured it would  at least give me an idea of what things I could fix, and what stuff I'd have to let them take care of at some future point, due to not having the right tools, or time to do myself.