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Old 08-10-2013, 11:36 PM   #1
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High Speed vibration

Hi All,
I have a stock 1997 TJ SE with a screaming? 2.5L. When I do get it above 65MPH I develop a vibration that feels like it's coming from the rear end. I've checked the U joints. I checked that it's not engine rpm dependent. I guess it must be something in either the transfer case or the differential? As I said I don't notice the vibration until about 65mph and it becomes more pronounced the faster I go. I would appreciate any ideas. Thanks

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Old 08-11-2013, 12:20 AM   #2
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Just a guess, but you could need your tires rebalanced. Good Luck.

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Old 08-11-2013, 12:33 AM   #3
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That was a thought. I bought new tires and had them balanced at the time of purchase. I may go back and have them try again!
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Old 08-11-2013, 12:34 AM   #4
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I had 31's before and I've gone back to a more highway friendly tire.
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Old 08-11-2013, 01:38 AM   #5
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Do you have stock tires and rims? My guess is that your tires aren't propely balanced. I had that problem right out of the gate with my new Wrangler. Then, I had new tires recently and it has rode smoother than ever before. The store I went to had an excellent reputation, and they must have balanced my tires perfectly. 75MPH and it drives like it wants to go faster. Another option is to have the driveshaft balanced. You would be amazed at the ride after that is done.

I had a restored '67 Mustang GTA convertible years ago that use to shake terribly at 65MPH. So, I had my driveshaft balanced. After that, it took off like it was riding on air at 70MPH. Unfortunately, it drove so well that I blew out my head gasket at 110 MPH.
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Old 08-11-2013, 03:57 AM   #6
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I had same issue it was tires for me.
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Old 08-12-2013, 12:57 AM   #7
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Well...it's back to the tire guy for a rebalance!
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Old 08-12-2013, 12:59 AM   #8
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Oooops forgot.... I have stock rims and P225 75R 15's on it now.
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Old 08-12-2013, 07:38 AM   #9
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Quote:
Originally Posted by ChasUGC View Post
Do you have stock tires and rims? My guess is that your tires aren't propely balanced. I had that problem right out of the gate with my new Wrangler. Then, I had new tires recently and it has rode smoother than ever before. The store I went to had an excellent reputation, and they must have balanced my tires perfectly. 75MPH and it drives like it wants to go faster. Another option is to have the driveshaft balanced. You would be amazed at the ride after that is done.

I had a restored '67 Mustang GTA convertible years ago that use to shake terribly at 65MPH. So, I had my driveshaft balanced. After that, it took off like it was riding on air at 70MPH. Unfortunately, it drove so well that I blew out my head gasket at 110 MPH.
This is something new for me. What exactly can be balanced on a driveshaft? Can you give some more info on this?

Thanks!
Martin
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Old 08-12-2013, 09:22 AM   #10
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Let me ask this question:

Did you have this problem before you brought the new tires?
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Old 08-12-2013, 09:40 AM   #11
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Quote:
Originally Posted by Martin_N View Post
This is something new for me. What exactly can be balanced on a driveshaft? Can you give some more info on this?

Thanks!
Martin
Google it, there is a ton of information on balancing the driveshaft. In fact, one of the things that people check, prior to driveshaft balancing, are the u-joints. The OP said he checked those, so I proceeded to ask about the driveshaft balance.

But, clearly, the tire question needs to be asked first.
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Old 08-12-2013, 04:19 PM   #12
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Originally Posted by ChasUGC View Post
Google it, there is a ton of information on balancing the driveshaft. In fact, one of the things that people check, prior to driveshaft balancing, are the u-joints.
Learned another thing. Thanks
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Old 08-12-2013, 05:55 PM   #13
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I had a vibration that would start around 55. (felt like running over reflectors) I thought the same thing tires, u joints, rear drive shaft balance...ect. Mine was coming from the front drive shaft. (bad slip yoke) The front ds had 3/8 in up and down play in it.

Replaced it with a Tom Woods.

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