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aaronb · 05-04-2018, **(Subject: Drivetrain noise )**

My truck has picked up a drivetrain noise. It sounds like a scratching sound. It doesn’t do it continuously. It makes the noise, goes away, and makes the noise again while coasting. I can also hear it when I let off the fuel to shift gears. If i push in the clutch or take the truck out of gear the noise goes away. I’ve tried speeding the engine up while stationary and while coasting out of gear and it doesn’t make the noise. I checked the ride height because I put new tires on last week and it’s in spec. My truck is a 2013 Peterbilt 389 with an ISX, 18 speed, and 3.55 rear ends for reference. It has 720,000 miles on it. The engine was rebuilt at 480,000. The power divider about 100,000 miles ago. The clutch was replaced at 360,000 miles. As far as I know the transmission hasn’t had any work. If you have any ideas I’d appreciate it. Thanks.