Car Vibration - 50MPH+
 

My 1991 ZR1 has developed a vibration that appears to be coming from underneath, feeling it from my seat and through the steering wheel that is also vibrating a bit when it hits 50mph and over. Tires and balance are new. I will be taking in next week but wanted to get some feedback first on possible issues to look at.:salute: Thanks for your help in advance.

Re: Car Vibration - 50MPH+
 

As you mention, your tires and balancing are new... did this situation happen after the new tires? If so, your wheels are out of balance.

You also need to check your U Joints. If they have issues, you will vibrate like hell.

Re: Car Vibration - 50MPH+
 

Thanks, should have mentioned car vibrated b4 new tires and road force balance which leads to ujoints possibly but car only has 61k miles.


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Re: Car Vibration - 50MPH+
 

If you find it let me know... Mine has 20k miles and I also have a vibration over say 55-60. Well documented in the forum. I have tried 2 sets wheels and tires, balances, rf balance, had the trans out to replace pilot bushing and inspected u-joints then, they were fine. Added C-beam plates when putting it back together so that is even more solid. So I still haven't figured it out... One thing I have not been able to do yet is to get with the FBI guys up north and try a completely different set of known good tires/wheels. One of these days hopefully I get time to do that... :o:o:o

Re: Car Vibration - 50MPH+
 

BTDT...I think. I was getting a vibration - more like a "BUZZ" at speed. Did NOT go away when I shoved in the clutch, which lead me to thinking "drive shaft". So, I had a driveline shop install new SPICER U joints and balance the drive shaft. That CURED my "buzzing".

BTW, I have a set of stock wheels you can use for your testing. Lemmeknow if you want to borrow them.

Re: Car Vibration - 50MPH+
 

Mine is a definite shake. Totally feels like out of balance tires. Both sets I have have been balanced and rebalanced. Gonna have to bring it up there some day and try one of your guys sets and see if that fixes it or if I have another issue. My joints on driveshaft were tight as can be when I had it out...

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Re: Car Vibration - 50MPH+
 

This may be way out there, but do you get the fly wheel rattle at shut down? I have seen the DM fly wheel go bad.

Re: Car Vibration - 50MPH+
 

Nope.

Re: Car Vibration - 50MPH+
 

Just going through the checklist:

• Half-shaft U-joints
• Wheel bearing(s)
• Suspension bushings
• ...
• ...
• ...

Re: Car Vibration - 50MPH+
 

I had the same issue, drove me nuts. Tried everything, tires , balancing, a known good set of wheels from my 86. I even changed the steering rack. Sitting in the garage staring at the car wondering whats up I pulled the right front shock off. It would only travel about two inches and stop. Low miles car no damage on shock. Changed shock and problem fixed. Just when you going you saw it all. Good luck.