Hello forum,

I have a high mileage 04 g35 coupe. I also have a lovely vibration that comes on around 60mph and continues as the speed climbs.
What I've done/replaced so far:

Shocks/Struts
Tierod ends
Wheel bearings
Alignment
Different rims and tires
Upper control arm and upper balljoint
Removed wheel spacers
Lower control arm

The vibration is funny because it seems to get better/worse depending on temperature outside.
I am suspecting the compression rod, since a) its the only suspension part I haven't replaced on the drivers side
b) the weirdness of temperature effecting how strong the vibrations are.

I do not get the tell tale clunking/creaking though that most experience, so I'm not too sure. I had this issue on the passenger side and replaced that already.

Any input is appreciated. Thanks in advance!

 

try replacing the lower ball joint also.

 

Make sure you don't have a brake caliper locking up on you. I had a nasty shake that would start at about 50 60 mph was rear caliper locked up.

 

How did you determine this was the cause?

 

Caliper locking up is easy to figure out...block your front tires, jack up the car with it out of gear and brake off. Spin the back wheels, they should do so freely. Or after driving for a while at night check out the color of your rear rotors, they shouldn't be red. Quit throwing parts at your ride, find an independent brake/alignment shop in your area. That's all they do is suspensions and they'll be able to find the cause of the vibrations you described!
Gary

 

^^^ what he said