yeah i have hubcentric rings on the wheels/hubs.

ill check the rubber mounts and see if there is any visible damage/excessive wearing

 

Did you figure it out? Same exact thing is happening to me

 

I had a similar cyclic vibration like you're describing on my sedan. My lower control arm bushings were shot and the arm was pushed forward. Replaced those as well as compression rod and lower shock mount bushings with energy suspension polyurethane ones, rotated and balanced the tires. No more vibration and much better steering feel.

Probably not this but check for a bent rim as well, sometimes this can appear as a vibration at higher speed.

 

I had this problem I highway speed when decelerating. Turned out the rear differential bushing had blown. It was pretty obvious because goo was going down the rear diff cover. Replaced with whiteline diff bushings, vibration gone.

 

thanks guys, i will look in to all those bushes and see if any are shot

 

OK guys let me set something straight. The drive shaft will spin in Neutral causing the rear wheels to spin when they are lifted off the ground. This is the force on the clutch when in neutral/disengaged. However, when the rear wheels are on the ground, the car is too heavy causing the drive shaft to stop (not enough force on the clutch). Go ahead, give it a try...I thought my car was messed up when I saw it

 

mysterious vibrations and bushes.

what the hell is this

 

after reading the thread and all the back and forth or how a driveshaft works I began to forget the purpose.....by forgetting what the OP had asked in the first place lol

 

if the car is in neutral how can u even assume the drive shaft would spin.

 

Have you tried it with the rear wheels off the ground? Have you been in neutral and without pushing the clutch in, tried to force the shifter in first gear and the car moves forward? Go for it maynnnn

 

wow, you really have no idea how a gearbox and clutch works.

 

now i remember why I have him on ignore.

 

Do you want me to take a video??? Yes I know how it works but the with the rear wheels off the ground they spin I HAVE SEEN IT

Give it a try sennnnnnnnnnn

 

Even though this thread is way off topic, I only posted the previous information because you said the drive shaft is stopped...I was just being technical. Check out these threads:

https://g35driver.com/forums/drivetr...isengaged.html

https://g35driver.com/forums/engine-...n-neutral.html

https://www.google.com/#safe=off&scl...w=1608&bih=872