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Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-10-2006, 01:46 AM   #21
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My Aurora did it pretty bad with the Goodyear Eagle RSA'* it had on there stock. I swapped those out and put some Pirelli'* on it and the vibration is STILL there. It'* not as bad, but it'* still there. It'* annoying that such a nice car has that vibration problem on the highway, especially at most highway'* speed limit. Our 2000 SLE has it too, but the 2000 SSEi we own does not.. odd.. very odd!

(BTW, I have 16" rims, the SSEi and SLE both have 17" rims.)
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Old 02-10-2006, 03:48 AM   #22
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Custom were they all low profile?
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Old 02-10-2006, 01:48 PM   #23
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Nope, the SLE/SSEi have lower profile tires than my Aurora does. The overall height between the 17" rims + tires on the Bonneville, and my 16" rims + tire is the same height. My tires are basically an inch thicker than the Bonneville'*, and I still have the vibration problem..
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Old 02-10-2006, 02:20 PM   #24
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Ya doent seem to matter what rim size is my 16s just as high as the 18'* with rubber
attached. Must be something to vibration other than the tires.
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Old 02-16-2006, 09:06 PM   #25
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Just found this site and am happy to say this is my second Bonneville I have owned and strangely enough I am having the same problem with vibration as some of you have had. Dealer has informed me 3 of the tires are bad so they are going to replace them and the car only has 3000 miles on it. Why not all 4 I have no idea but GM does. I had a 2003 SSEI and now have a 2005 GXP, nice to see some people have nice things to say about a great car. I will let you know how the new tread works out and will be happy to post more as time goes by.
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