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shaking, in my seat

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Old Jun 25, 2013 | 05:24 PM
  #1  
vettster666's Avatar
vettster666
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Default shaking, in my seat

Hello all have an 1981 vette, I got this shake in the rear drive train,
when on the gas you feel it, get off the gas shake smooth out, you feel it right in the seat.
I balanced all four wheels,
Changed u-joints on drive shaft,
Checked out shorty's u-joints, all tight,
Rear wheel seals are good,
motor mts. good,
differential ? don't know.
Anyone else come across anything like this?
Thank You for any help.
Phillip vettster666

Last edited by vettster666; Jun 25, 2013 at 05:26 PM. Reason: making more clear
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Old Jun 25, 2013 | 05:29 PM
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I'm no expert, but how are your trailing arm bushings?
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Old Jun 25, 2013 | 05:48 PM
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vettster666
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Thx for answer, all bushing are great shape
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Old Jun 25, 2013 | 09:24 PM
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buckhorn 76
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From: buckhorn Ontario
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sometimes if the driveshaft or half shafts are re-installed 180 degrees out they will be unbalanced and the car will shake like hell.
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Old Jun 25, 2013 | 09:44 PM
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Check for runout on the rear wheels, might have a bent hub.
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Old Jun 26, 2013 | 06:36 AM
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When at speed, and the car is shaking, put the trans in 'neutral' and coast at that speed and check whether vibration is about the same or much reduced. If the same, your problem is in the drivetrain after the trans. If the vibration is much better, the problem is in the engine/engine-accessories/transmission environment.
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Old Jun 27, 2013 | 08:53 AM
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Thank you all for helping, I'll check each one out.
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Old Jun 27, 2013 | 09:09 PM
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Change the rest of the u-joints . The only way to really check a u-joint is to take it apart . While you have it apart you may as well put new ones in .

Bill
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