Ever since I put my new motor in my car I have heard this weird noise. The thing with the noise is I only hear it between 3400 and 3600 rpms in 5th gear. I do not hear it in any other gear. The noise is hard to explain but sounds almost like a gurrgling or like a woodpecker pecking on a hollow log with some water in it. I have checked all the bolts tubes, wires fluids and everything is fine. Has anyone ever had this noise or problem. There is no performance loss or anything. Just a really weird noise and I just want to make sure this is not something common or something that maybe going wrong with this engine. Please no flames about my description of the noise.

 

ttt

 

it sound like it is dentonating..and knocking