Question about 1997 GMC Jimmy

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Vibration at 60 mph

Ok I put new tires on the front ( rear was 95%) and drove it off. Now I have a vibration once I hit 62/63 MPH that was there prior. Here is the kicker it doesn't do this all the time it will ride smooth then start the vibration. Now I have taken it back 4 different times and I watched as they zeroed out all 4 tires and the alignment is spot on. They were scratching their heads when I left the last time! So they advised the front end is in near perfect condition but I will need front shocks shortly. So I was thinking could it be the drive shaft out of balance or the shocks please help!

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Not sure but it sounds like you could have a warp brake rotor. The drive shaft is a possibility however you should be able to check it easy enough to see if any of the U-Joints have movement. The only other thing that comes to mind is wheel bearings and they are a little harder to check properly. Good luck.

David

Posted on Jun 21, 2009

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Bent rims maybe or tires. I had a similar problem with two of my cars. One of them it was the tires,figured that one out when I sold the car & put the Original ones on. A second time I balanced my wheels & found out the rim was bent. By the way, some radials can not be rotated cross-wise just front to back on the same side. Hope this helped.

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You could rotate the tires front to back and see if the vibration moves.
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Most likely a tire/wheel balance issue. The weights that are used to balance the tires can sometimes fall off. Generally how far out of balance it is determines when and how bad it will shake. Unfortunately this is not fixable without a tire balancing machine, has to got to a tire shop.

Were the tires rotated or replaced recently? Most major tire shops will check the balance for you at little or no charge if you take it back to the shop where the work was done.

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