Rattle noise coming from transmission please help

[Texas disaster]

I have an 04 Silverado EXT cab 5.3L Auto Trani. When ever I sometimes start to accelerate I will hear a rattle at the beginning of acceleration. I am not noticeing it happen at any specific gear. Has anyone ever noticed this or have any ideas what it could be? I took it to the dealership about a 2 months ago and of course they could not hear it.

[mmmikkke]

Could be a cracked flywheel. If so it should gradually get worse, until it rattles even at less than full throttle.

[LaidBack1]

I have an 04 Silverado EXT cab 5.3L Auto Trani. When ever I sometimes start to accelerate I will hear a rattle at the beginning of acceleration. I am not noticeing it happen at any specific gear. Has anyone ever noticed this or have any ideas what it could be? I took it to the dealership about a 2 months ago and of course they could not hear it.

 

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I had a very similar issue on my 93 3 weeks ago. The way the noise resonated through the floor I would have bet money it was the tranny, turned out to be the 4 month old catalytic converter.....just a thought.