Ticking sound at 75-80 MPH and 3k RPMS.
 

Ok I was driving my 03 g35 auto and I noticed a loud ticking sound only when I got to 80 mph. I feared the worst and thought it was a rod bearing. I pulled over check the oil was good ticking stopped as I was pulling over. I went on my way and it went away. Well I was driving again at 80mph and heard it again. I rolled my window down and heard it begin faintly at 75mph and then kick in at 80 mph and 3k rpms. I was then cruising at about 50mph in manual mode in 3rd gear and I heard a faint squeeking sound. I have replaced my belt so I don't think its them. Anyone had a problem like this? Also driveabilty is fine and no MIL light.