Just bought a used Express 2500 with 49k on it. After driving for one week, noticed a irritating scraping sound (also sounds like water running through old house plumbing pipes) coming from transmission just before shifting into 2nd gear. i brought it back to the dealer and they told me there is a tech service bulletin stating that this is a know problem with this model and there is nothing that can be done about it!
Anyone else heard of this?

 

What model year is your vehicle?

Jeff Morris, Chevrolet Customer Service