First time poster, long time lurker. FAQ/search generally gives me what I need.

Problem:

2006 G35 Sedan M/T - 137k miles All stock except strut tower brace, which is tight.

Vibration shows in steering wheel, shifter and front seats. Starts at low speeds- 10mph and exacerbates as the speed increases up to 90MPH plus.

I noticed the vibration seems to increase around 2000-2300 rpm in all gears.

The vibration remains with transmission in neutral. The car rolls freely in neutral and doesn't seem to bind. It lessens slightly around 83MPH in 6th gear and lessens VERY slightly with engine under load or on long sweeping highway turns.

The vibration started about 3000 miles ago and is worsening. I hit a piece of road debris, possible rubber base of an orange safety cone, and the car pulls a little harder to the left now, at all speeds. I also have bad bumpsteer to the left at highway speeds. The bumpsteer has been worsening over the past 5000 or so miles.

Solutions? Replace parts and get alignment? But which parts?

I have had the tires balanced and replaced ALL rotors and pads. Vibration has actually worsened over past 3 weeks. I need to get the car on jack stands and check wheel bearing play and visually inspect tomorrow.

Parts replacement?

I am thinking compression rod bushings and possibly ball joint replacement? Sway bar endlinks/bushing? LCA bushings? Tie rod ends? Wheel bearings?

https://conceptzperformance.com/ener...121_p_5967.php

What has solved bump steer and severe vibrations for you?

 

Have your bushings inspected by a professional, as you seem to either have a major wheel problem or you have parts walking around in the suspension that shouldn't be. You likely shouldn't be driving that car with those issues!

 

And especially 90 mph, what are you nuts? I often offer this advice, works for me when I can't find an answer: find an independent brake/alignment shop in your neighborhood, they'll locate your issue in minutes! All they do is suspensions and must be good or they wouldn't be in business!
Gary