Alrighty, so here we go. My Z is a 88 2+2 5 speed. I recently did a burnout one of many since ive had the car for a year. After my burnout i noticed that I was getting a really bad vibration but I can't pin point it, it shakes the whole car very bad yet the steering wheel doesn't shake nor does the car drift either left or right. I am very confused, I just noticed that my wheel bearings in the passenger side front wheel need to be replaced and that the sway bar end link bushing is like nonexistent at this current time, could this cause such a noisy and vicious vibration? It happens through all gears all speeds and all rpms and isnt as noticeable when i accelerate or am cruising but the second my foot comes off that gas completely, my car shakes like no other. O and i was experimenting with this but i noticed that as long as the car is in gear and i am just even lightly touching the gas the vibrations are very minimal compared to any other time. could this be a combo of the wheel bearings and bad bushing? driveshaft? tranny? any help would be appreciated, bearings and bushing will be replaced very soon. Thanks

update: I also have had wheels balanced and rotated a few days ago and still no change in behavior

 

Check the ujoints in the driveshaft and check the diff mounts.

 

How will i know whether or not they are bad?

 

Also check for a separated tire on the rear.

 

Whats a Separated tire?? Wouldn't I have noticed that when i balanced and rotated the tires?

 

Tires are made of layers of steel bands and the bands can "separate" from each other. It looks like an egg in your tread. Did you balance and rotate after your burnout?

 

Yes I did a few days after

 

Then its probably not in your tires. It'll probably be a mount or axle. I mis-read your first post. I thought you rotated before the burnout.