Rattled noise under engine/tranny

[Dropped95silverado]

I have a link to the video in which you can hear the noise. http://youtu.be/yWlEEcx71Sg Anybody know what it could be? Thank you

 

[Keepinitoldskool]

Sounds like a cracked flexplate or failing torque converter

 

[Dropped95silverado]

Sounds like a cracked flexplate or failing torque converter

I replaced the flex plate 5 months ago.

 

[Keepinitoldskool]

I replaced the flex plate 5 months ago.

Then pull the cover and inspect the bolts. They may have backed out, seen it happen alot.

 

[magimerlin]

Same here... I always use a dab of rtv on the bolts that hold the flex plate to the motor. It's habit from doing the Ford ones that have oil all the way back into the threaded holes in the crank..then use blue lock tite on the converter bolts.... never had one loosen up and done alot of them, especially lately at work...lol.

 

[magimerlin]

But sounds like the torque converter bolts are loose to me....should be easy to check either way as it looks like you have no inspection cover installed....

 

[96Z71ECSB]

I may be way of base here, but it sounds like an exhaust rattle to me.
A loose exhaust shield or possibly something in the exhaust.

Crawling underneath while it's running (on jack stands) would be the best way to pinpoint where the noise is coming from.
That's how I found my rattling torque converter.
Yours doesn't sound like mine did though.