2016 Silverado screeching noise, grinding noise

[Max5240]

Hi everyone, I'm new to the form and hope I'm doing this right.  I was looking for some input on an issue I've been having with my truck recently. After the truck gets warmed up and drove around for a while it will make this grinding/screeching noise from around the transmission area. It will only make the noise when the vehicle is in drive/reverse and I am stopped on the break. The noise goes away immediately after it gets switched to neutral/park or when the truck gets moving with a very minimal amount of throttle. I do also have a cosra cat back on the truck. The only mod done to the truck. I've had it in and out of the dealer at least 4-5 times and of course the issue can not be replicated while the vehicle is in there possession. The one time that it was making the noise when i brought it in the shop manager immediately was pointing fingers at the exhaust. He was trying to tell me that it had to do with a back pressure issue since its not the stock exhaust. After i got home and looked at gm's site for there cat back and it states that it relieves back pressure up to 66% so now i know he is just making stuff up. i also recorded a video clip of the noise it was making that i will link. If anybody has any clue on what the issue could be it would be greatly appreciated.  

 

 

 

[SS502]

4 minutes ago, Max5240 said:

Hi everyone, I'm new to the form and hope I'm doing this right.  I was looking for some input on an issue I've been having with my truck recently. After the truck gets warmed up and drove around for a while it will make this grinding/screeching noise from around the transmission area. It will only make the noise when the vehicle is in drive/reverse and I am stopped on the break. The noise goes away immediately after it gets switched to neutral/park or when the truck gets moving with a very minimal amount of throttle. I do also have a cosra cat back on the truck. The only mod done to the truck. I've had it in and out of the dealer at least 4-5 times and of course the issue can not be replicated while the vehicle is in there possession. The one time that it was making the noise when i brought it in the shop manager immediately was pointing fingers at the exhaust. He was trying to tell me that it had to do with a back pressure issue since its not the stock exhaust. After i got home and looked at gm's site for there cat back and it states that it relieves back pressure up to 66% so now i know he is just making stuff up. i also recorded a video clip of the noise it was making that i will link. If anybody has any clue on what the issue could be it would be greatly appreciated.  

 

 

 

You said it all when you said “cat back” if your cats are there and you didn’t mess with them you’re fine. You could run the exhaust out of a tuna can and be fine. It does sound like something is vibrating metal to metal but I’m listening through my phone. Odd sound.

[redwngr]

Sounds to me like a pulley rubbing. Or a fan hitting housing.

 

Perhaps because of a bearing that is out.

[redwngr]

If service adviser heard that they need a new job.

 

If service manager heard that, you need a different dealer.

[Max5240]

its not the fan, the noise is not coming from the engine bay. and yes I will be going to a different dealer next time i take it in