My truck is 2002 2500 6.0 automatic. I've only had this truck for a couple of weeks. There's a ticking noise that appears to be coming from within the inside of my dashboard when the truck starts. This ticking noise sounds like a speedometer cable. It happens when I start off rather slow. It goes away once the truck shifts into 2nd gear. The truck runs fine otherwise.

Any helps or ideas would be greatly appreciated.

 

I just took the truck to get inspected at a GM dealership. The service advisor went with me on a test drive. He said the noise is coming up from the transmission. It only happens in first gear. He said this was normal and even some new trucks make this noise. He mentioned something about how the first gear meshes.. or something like that and that is the noise I'm hearing. I must admit the slight clicking/popping/scratching noise in first gear is tolerable, but I just needed to know that it wasn't a defect or problem that would destroy my transmission.