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Subject: O.T. Drivetrain Vibration

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joe in wilkinson    Posted 01-28-2020 at 06:08:03 [URL] [DELETE]        [Reply] [Email]  
  • O.T. Drivetrain Vibration
  • Didn't get any satisfaction from Trailblazer Forum. More experts here, so I'm fishing for help.
    2003 Chevy Trailblazer 6cyl 4WD LS Starts vibrating through the steering wheel and can feel it generally at about 30mph and above. If I let off the gas, the vibration stops. It is a rust-bucket on the bottom side, but the universal joints "look" OK. I don't feel any looseness, but that doesn't guarantee anything. Any suggestions as to isolating the problem i.e. rear end, transmission, drive shaft?? It shifts O.K. in 2 wheel, 4 wheel high, 4 wheel low.

    Bruce(OR)    Posted 02-13-2020 at 12:56:49 [URL] [DELETE]        [Reply] [No Email]  
  • Re: O.T. Drivetrain Vibration
  • Email sent

    joe in wilkinson    Posted 02-13-2020 at 14:07:47 [URL] [DELETE]        [Reply] [No Email]  
  • Re: O.T. Drivetrain Vibration
  • Thanks Bruce,
    The vibration starts at about 30 mph. When I let off the gas, and coast, the vibration stops.  It only occurs under power.  So, I believe the tire balance is O.K.  I took it for another test drive and it began making strange noises in the rear end.  I thought at first it might be one of the universal joints, but they both appear to be tight and could not see any missing parts.  I believe now that the problem may be in the differential.  It is a "rust bucket" on the bottom side and and that is when I start twisting off bolts.  Still deliberating now about whether to give up and replace the whole vehicle.  A 17 year old rust bucket is the  problem.  "I know", I know, I still nurse my 70 year old 8N. I answer your email here so others can see.

    MikeinCO    Posted 01-28-2020 at 10:53:33 [URL] [DELETE]        [Reply] [Email]  
  • Re: O.T. Drivetrain Vibration
  • My old Chevy pickup had a similar vibration. Found out the drive shaft was out of balance.    Posted 01-28-2020 at 08:34:59 [URL] [DELETE]        [Reply] [Email]  
  • Re: O.T. Drivetrain Vibration
  • Wander if a balance weight hasn't come off of the flywheel

    al in Texas    Posted 01-28-2020 at 08:14:53 [URL] [DELETE]        [Reply] [Email]  
  • Re: O.T. Drivetrain Vibration
  • Check the motor mounts

    joe in wilkinson    Posted 02-13-2020 at 14:09:27 [URL] [DELETE]        [Reply] [No Email]  
  • Re: O.T. Drivetrain Vibration
  • Motor mounts are O.K. Good and tight. Thanks for the suggestion.

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