Vibration, WTF???
Vibration, WTF??? Somebody please give me an idea here...
I have a strange vibration that starts around 75-80mph and goes away around 90-95. This is a pain in the *** since I travel interstates that the speed limit is 70-75. I have had the tires balanced, it's got new(er) rotors. They're not warped. Car is an M6, stock 10 bolt rear, and suspension. What's the odds the driveshaft could need balanced? Tire wise, I'm running Kumho Ecsta ASX (the all seasons) up front and Nitto DRs in the back. There is no rear end noise at all. The car has seen around 6K RPM in 5th gear. Could I have screwed something up there? There's no noises in the car...other than the typical F-body squeaks/rattles.
I have a strange vibration that starts around 75-80mph and goes away around 90-95. This is a pain in the *** since I travel interstates that the speed limit is 70-75. I have had the tires balanced, it's got new(er) rotors. They're not warped. Car is an M6, stock 10 bolt rear, and suspension. What's the odds the driveshaft could need balanced? Tire wise, I'm running Kumho Ecsta ASX (the all seasons) up front and Nitto DRs in the back. There is no rear end noise at all. The car has seen around 6K RPM in 5th gear. Could I have screwed something up there? There's no noises in the car...other than the typical F-body squeaks/rattles.
Good point on the poly mount...Didn't think about that. 
I haven't changed the clutc/flywheel. Actually my stocker is toast and as soon as TSP gets the backordered parts in my cart is heading that way for a Billet Fly and RAM Powergrip HD.
I haven't changed the clutc/flywheel. Actually my stocker is toast and as soon as TSP gets the backordered parts in my cart is heading that way for a Billet Fly and RAM Powergrip HD.
Last edited by Demon_Speeding; Oct 20, 2005 at 10:34 AM.
Staging Lane
Joined: Dec 2003
Posts: 60
Likes: 0
From: Los Angeles
I agree, check you're tire balancing again I had a bad vibration problem around those speeds as well, it was tire balancing. Do your wheels have weights on the outside? If they only balanced the tires with weights on the inside, that might not be enough. Putting weights on the outside completely fixed my problem.
Good Luck!
Good Luck!
my car started doin this about the exact same speed when i put the poly trans mount on it i just ignore it i think it may bee the poly trans mount (thats when mine started) and i have the same setup as you
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Mybluey, I do have my tires balanced with weights on the inside only. I may take them somewhere and see if they will balance them with the tape weights. If nothing else I'll just have them balanced with weights on both sides instead of the static balance.
I've checked everything I can and it all seems good. I'm going to bet it's a balance thing.
Thanks guys!
I've checked everything I can and it all seems good. I'm going to bet it's a balance thing.
Thanks guys!
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Thanks again to all for the input. I just got paid my bonus and nearly a year's salary difference...Daddy's getting all new rear suspension, 9", driveshaft and a cam. 
I think I'll get rid of the vibration...
Just to wind up with another headache I'm sure.
I think I'll get rid of the vibration...Just to wind up with another headache I'm sure.
Copy & Paste Moderator
Joined: Apr 2002
Posts: 9,764
Likes: 208
From: Eastern MA
When you go to get your tires re-balanced, take it to a place that can do a "road force" balance. In addition to the balance, a roller is pressed against the tire to see how it handles "road force". This will show defects in the tires that can become evident as an odd vibration at certain speeds or premature failure.
Originally Posted by VIP1
When you go to get your tires re-balanced, take it to a place that can do a "road force" balance. In addition to the balance, a roller is pressed against the tire to see how it handles "road force". This will show defects in the tires that can become evident as an odd vibration at certain speeds or premature failure.
