Over 110mph horrible vibrations, but everything is fine at 80-90.
11-20-2005, 01:42 PM
#1
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Join Date: Apr 2003
Location: Dallas/Fort Worth
Posts: 892
Over 110mph horrible vibrations, but everything is fine at 80-90.
What could cause such a high speed vibration when at any speed under 100 everything is fine. I mean, it is a real good vibration, enough that is slows me down because of it.
Any ideas?
-James
11-20-2005, 01:45 PM
#2
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Join Date: Oct 2005
Location: Monmouth County, NJ
Posts: 501
Re: Over 110mph horrible vibrations, but everything is fine at 80-90.
Check your alignment, tire balance, air pressure. Could be a lot of different things. I wouldn't believe any of it would be serious.
11-20-2005, 02:53 PM
#3
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Join Date: May 2004
Posts: 406
Re: Over 110mph horrible vibrations, but everything is fine at 80-90.
Originally Posted by BlackLT1_TX
What could cause such a high speed vibration when at any speed under 100 everything is fine. I mean, it is a real good vibration, enough that is slows me down because of it.
Any ideas?
-James
I have something similar in my firehawk, and my 96 ta. in my 96, it around 100+, and my firehawk, 90-95+. Ive read that the stock lt1 driveshaft is usually the culprit, and a ls1 driveshaft swap is the cure.
11-20-2005, 03:21 PM
#4
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Location: Houston, Tx
Posts: 1,669
Re: Over 110mph horrible vibrations, but everything is fine at 80-90.
i had a vibration like that before,..
ended up being my transmission (stall) was toast...
so if you have a stall or any work done to ur tranny. That could be it. also another thing to check into is your driveshaft!
ended up being my transmission (stall) was toast...
so if you have a stall or any work done to ur tranny. That could be it. also another thing to check into is your driveshaft!
11-21-2005, 06:47 AM
#6
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Join Date: Mar 2001
Location: Eastern NC
Posts: 373
Re: Over 110mph horrible vibrations, but everything is fine at 80-90.
Have you changed the tranny mount? If so, I hope you didn't use an ES mount, they have had issues since the mount seems to be out of spec with the factory mount. After my factory mount exploded, I changed to an ES mount which caused my teeth to chatter at higher speeds 
. If this is the problem, go with a factory LS1 style which has the "interlocking" design in case you break it (unlike the factory LT1 mount).
The LT1 driveshaft also has some balancing issues which could cause vibrations. I went to the 1LE shaft.
. If this is the problem, go with a factory LS1 style which has the "interlocking" design in case you break it (unlike the factory LT1 mount).The LT1 driveshaft also has some balancing issues which could cause vibrations. I went to the 1LE shaft.
Last edited by curly; 11-21-2005 at 09:12 AM.
11-21-2005, 07:40 AM
#7
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Join Date: Mar 2003
Location: Palm City, Florida
Posts: 4,287
Re: Over 110mph horrible vibrations, but everything is fine at 80-90.
If you're using a poly trans mount, swap it out for a rubber LS1 mount. This fixed my high-speed vibrations....the car was unbearable on the highway and got worse as RPMs/MPH increased.
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