I've been running B&G lowering springs for the past year with no issues. I recently installed Progress springs, which are slightly lower in the front. Immediately after the install (first roadtest) I'm feeling this vibration while lightly accelerating. Happens at approx. 1700 to 2200 RPM. Vibration is felt through body and floor, not steering wheel. No vibration on hard accel. Goes away if accelerator is released or shift to neutral. Not vehicle speed sensitive, only load and rpm sensitive. Not a tire balance issue or bent wheel. No problem found when installation of springs was inspected. Possibly caused by increased angle through cv joints from lowering more? Does anybody with these springs, or more drop notice this? Any input is appreciated.

 

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Anyone have opinions? anyone have a vibration with low suspension? How about those very low with coilovers?

 

I never seemed to have a vibration as a result of new suspension installation (not with S-Tech/GR-2, Stock, H-Tech/Illumina) until a little while ago.

I just swapped my front end to H&R front springs and OEM struts and I'm getting a vibration around 65-70 mph. Below or above that it's smooth.

I don't seem to recall it vibrating before I did the suspension, but then again I'm not altogether sure. As such, I've been meaning to get the tires re-balanced to see if that alleviates the problem. If that doesn't work then I'll figure out where to go from there.

Maybe try getting the tires balanced? I know, doesn't make sense if they were just fine before, but might as well eliminate the obvious before guessing on something else.

 

alignment. any time you take the suspension apart, you are prone to change aligment of the wheels.

 

Had Progress springs for over a year and a half, never had any such vibrations.

Did you check to see if something is loose or rubbing?

 

Yeah, already did that. Vibration still there.