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post #1 of (permalink) Old 05-06-2000, 03:42 PM
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Bad Vibrations

Well, I finally have the beast back and unfortunately, all is not right with the world or the Tracker...I've got a little over 91,000 miles on it and I've noticed that when I start the Tracker, there's a slight shaking and a metal to metal contact type sound...I've got an auto tranny with the 16v motor and while going down the highway, between 3600-4100 rmp and 65-80 mph, theres a slight vibration and or noise...if I slow down or go faster, the sensation and noise go away...I've had 2 Chevy dealers look into this, though one isn't fit to wash the wheels, and so far, no answers...I'm wondering if when the one dealership had the tranny out, for a rear main seal fix, the left out some sort of rubber isolator or if a motor mount is going south on me...I've also had the harmonic balancer replaced....Any ideas are welcomed and as always, thanks. pooohber.

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post #2 of (permalink) Old 05-07-2000, 01:34 AM
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Re: Bad Vibrations

While I could be wrong think a motor mount would change its miss behaving signs as you stepped on the throttle and took foot off of throttle.

Possible when they took the transmission out the had the drive shaft apart at the expansion joint and didn't get it back together right but that doesn't really fit the way it is vibrating. Drive shaft vibrations you feel in your seat always starting a same speed normally 15 to 30 rpm.

Tires could be the cause of your vibration I have had some that start vibrating above 55 because they couldn't get them to dynamically balance above that speed and still have them balanced as good below that speed. A tire could be a little out of round.

If your harmonic balancer or flex plate was the problem the vibration should be more RPM dependent not speed dependent. Shift gear selector to check that.

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