Shaking/Vibrations at high speed?

[Clied]

My car at around 80-90MPH has some severe vibrations and shakes at high speeds. I know I need to get a alignment but are there any other things that could cause it to behave this way?

 

[Dunckel]

Read these. They might give you some good ideas.
http://www.supramania.com/forums/showthread.php?t=45682&highlight=vibration+high+speed
http://www.supramania.com/forums/showthread.php?t=17791&highlight=vibration+high+speed

 

[NewWestSupras]

Spin all the wheels up independently and make sure they are round, unbent, and balanced. Check your tires carefully for any ballooning or torn layers. Check your front suspension components, (like inner tie rods, balljoints). Make sure your d/s and carrier bearing (if you have one) is A1. While your under there, ensure your sways, endlinks, traction bars, and tranny mounts are all good as well, Gl!

 

[jdub]

And make sure all your lug nuts are torqued down correctly

 

[got_boosted]

And make sure all your lug nuts are torqued down correctly

Scary...

+1 on checking the driveshaft. That was the first thing that came to mind.

Collin

 

[Clied]

Alright I'll check the drive shaft when I have time to.

 

[OneJSupra]

Spin all the wheels up independently and make sure they are round, unbent, and balanced. Check your tires carefully for any ballooning or torn layers. Check your front suspension components, (like inner tie rods, balljoints). Make sure your d/s and carrier bearing (if you have one) is A1. While your under there, ensure your sways, endlinks, traction bars, and tranny mounts are all good as well, Gl!

while you under there...check your engine mounts as well.

 

[queenskid926]

also Tranny mount, Driveshaft center bearing

 

[super.secret.supra.club]

while you under there...check your engine mounts as well.

and while your under there, rebuild your motor.:biglaugh::naughty:j/k

i used to get that in my 91. so i changed my brake pads and rotors and viola! problemo solved!

ed.d.

 

[KMinAF]

Is it speed related or drivetrain related? I have had a couple of different brands of cars (Subaru, Suzuki, Mitsubishi) come into the shop complaining of a vibration and the fault was an incorrectly tightened crank pulley that had started to come loose. Just one more thing to check....

 

[zachm611]

check tire pressure and tire sizes as well make sure they all match... i had mis matched tires when i first got my supra (found out the hard well not too hard way lol) my vibrations were crazy. got matching tires and my problem was solved

 

[Clied]

Just now I went to go see if the lug nuts needed to be re torqued. I jacked up each side and started tightening them. None of them were loose but I did notice that my rear divers side wheel jiggles and I can shake it by moving it with my hands. It does not move much but it still concerns me. Is there anything loose under there that I should torque down?

I checked tire pressure, it was fine. And all the tires are the same size and same brand.