Rattling Sound (possibly Tranny?) Envoy

[bamdoo]

Hello,

 

I have a 2003 GMC Envoy (6 cylinder) with 48,000 miles on it. When I press on the gas with the car in drive I hear a rattling (buzzing) sound, when I let go of the gas the sound stops right away. When I press the gas with the car in neutral or park the sound is not there. I had my cars tranmission fluid power flushed (as suggested by the dealer) 1 month ago and dropped the pan and replaced the filter about a week ago. There were no metal shavings or junk in the drop pan. The car is still making the sound. Any suggestions on what the problem might be.

 

 

Thanks for you help and input,

 

 

Rob