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Transmission making rattling, spinning noise

Tiny
BOBSONLY
  • MEMBER
  • 2000 GMC SIERRA
  • 4.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 294,000 MILES
I believe that my transmission is making a rattling, spinning noise underneath from a complete stop, like metal on metal, to a higher RPM then seems to fade out on the noise. In reverse it sounds like a 'snick' metal noise when the transmission is engaged. Scratching my head at this one. Help is appreciated. Transmission was overhauled a year ago.
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Saturday, June 16th, 2018 AT 7:14 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,967 POSTS
Hello,

If you can take a quick video of the noise and upload it in your response we can tell for sure, but it sounds like you have a cracked flex-plate or a catalytic converter that has fallen apart.

Here is are videos to help you see what you are in for when changing the flex plate or catalytic converters.

https://youtu.be/CORe9JyrexI

and

https://youtu.be/3vJAojsrfuU

Please let us know what you find.

Cheers, Ken
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Monday, June 18th, 2018 AT 11:23 AM

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