shakes when going 50+ - GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat

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shakes when going 50+

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Old 04-25-2009, 08:33 PM
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Default shakes when going 50+

i was driving down the road last night riding smoothly as always when i accerlerated above 50 its started to do a little shake,,i tap the brake the shaking stops (never going over 50 anymore)

what could cause that to happen ? i hope its not the transmission slipping.


PS. my serpintine belt is pretty worn out and i need to replace it.
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Old 04-25-2009, 08:41 PM
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Can you tell where the vibration is coming from? Try rotating the tires and see if the vibration follows. could be a shifted belt in the tire.
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Old 04-26-2009, 12:34 AM
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#1 supsect for vibration that comes on at 55 is tire balance.

If you feel the vibration in the steering wheel, this would support the balance theory. If you feel it though the car body (i.e. through your seat) and NOT through the wheel, it may be something else.
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Old 04-26-2009, 03:04 AM
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Originally Posted by teachutofly View Post
#1 supsect for vibration that comes on at 55 is tire balance.

If you feel the vibration in the steering wheel, this would support the balance theory. If you feel it though the car body (i.e. through your seat) and NOT through the wheel, it may be something else.
technically if you feel it in the seat it could still be one of the REAR tires being out of balance, id recommend rotating the tires IF its not in the wheel.

If its in the wheel already then prolly one of the fronts has a bad tire and they need to be checked/balanced

If its not, rotate them in an X pattern and if the problem THEN comes from the fronts then one of the *NOW* front tires has a bad tire and they need to be checked/balanced.

During the rotation visually inspect all the tires by rotating them around to see if you see any bad spots in the tires, ie bubbles, warps, bad cracks in the treads, nails, screws, etc...
If you do this and nothing changes, let us know
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Old 04-26-2009, 03:57 AM
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Ok thanks guys thats prolly 60% what the problem is, i mean the tires got i decent amount of tred but yet a few of them have cracks along the sides.

if its not the tires,what else can be the cause of a random car shake going over 50?
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Old 04-26-2009, 08:56 AM
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If not a bad tire it could be a number of things. Warped rotor, bad bearing, loose tie rod, ball joint. But let'* try the tires first.
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Old 04-26-2009, 04:25 PM
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k thanks everyone

ill post back
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Old 04-27-2009, 03:54 PM
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hey i just realized the whole time ive been driving the car in D with the box around it not plain D,could this caused the problem ? And whats the difference?
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Old 04-27-2009, 09:10 PM
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The D with the box around it is over drive
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Old 04-28-2009, 12:13 AM
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Ok,thanks alot..i guess its not a good idea to keep it in Over drive for everyday driving..i think thats what was causing the car to shake a little while moving 45-50+
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