Loud Rattling/Tapping between 1,000-1,500 RPMs?

2015 CHEVROLET SILVERADO
1,245,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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PAT1988
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Loud rattling and tapping coming from passenger side between 1,000-1,500 RPMs. The sound cannot be duplicated in park or neutral. Changed engine oil and filter, transmission oil and filter, and spark plugs, but problem persists. Checked all U joints and heat shields. Sound does not speed up during acceleration and stops around 1,500 RPMs. The truck has 124,500 miles, don't know why it saved as over 1 million. Thank you!
Video (Click to enlarge)
Attached Media
Jun 3, 2025 at 9:24 PM
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STRAILER
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Thanks for the video, it helps. To me it sounds like the exhaust system is contacting the frame somewhere, like a exhaust hanger is broken, or an engine mount is allowing too much movement. I would lift the hood and then have a helper step firmly on the brake pedal with the parking brake well set, then put the truck in drive and give the engine a little throttle. You should be able to see the engine jump upwards indicating a broken engine mount, if it seems okay the other problem can be a broken flex plate which means the transmission will need to come out. We need to locate the source of the noise to get an accurate diagnosis.
Jun 5, 2025 at 1:28 PM
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PAT1988
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Thank you!
Jun 5, 2025 at 2:09 PM
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STRAILER
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You are welcome, please let me know what you find :)
Jun 6, 2025 at 12:33 PM
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PAT1988
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Took it to a shop for diagnosis. Even though there was not a CEL on they said it had misfires on the number 1 and 7 cylinder. Bad camshaft and lifters. Thank you, Chevy AFM/DOD.
Jun 7, 2025 at 1:13 PM
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STRAILER
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Wow, that sounds way too deep to be a camshaft noise to me. Also, you said the noise does not happen in park or neutral? I am not sure of that diagnosis. :/
Jun 8, 2025 at 11:16 AM