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help with wierd vibration!!!

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Old 11-16-2008, 01:29 AM
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Red face help with wierd vibration!!!

hey guys i need some help figuring out this vibration.
ok my car is a a4 98 z28 with 3:23 rear.
the car feels fine when wot and just cruizing on the hwy but if im going around 75-80 and put it in 3rd on the gear selector and hold my speed i get a decent very noticable vibration but if i go wot from that speed its fine.
i put it on a lift and it all looked good.
could my drive shaft be out of balance?
what could it be?
Old 11-16-2008, 01:49 AM
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do u have a poly tranny mount?
Old 11-16-2008, 10:58 PM
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i have a 1le tranny mount.
Old 11-17-2008, 10:39 PM
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any help guys?????? i need ya.
Old 11-17-2008, 10:59 PM
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Driveshaft, put an Aluminum one in it.
Old 11-18-2008, 12:40 AM
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from what i know ls1 cars have an aluminum drive shaft dont it?
edit""" i did a search and it seems my ds is aluminum so should i get it ballanced?

Last edited by shaun; 11-18-2008 at 12:54 AM.
Old 11-18-2008, 01:13 AM
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Originally Posted by shaun
edit""" i did a search and it seems my ds is aluminum so should i get it ballanced?
I want to know where you "Searched"

If I was you, I would have went out and looked under YOUR CAR..


Old 11-18-2008, 01:44 PM
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the search i did was on here. and i really dident feel like going in my freezing garage and jacking the car up and geting under it lol.
from what i read the lt1 cars had a steel ds.
Old 11-18-2008, 03:01 PM
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possible balancer??




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