Drone?

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Aug 12, 2025
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I've had my ZR2 3L duramax for about 6 weeks - and I'm coming from a TRX. I love the truck - but for one (or maybe two?) fairly minor things. The biggest one is what I perceive to be is a bit of "drone" in the 70-75mph range while cruising. It's not the exhaust - as these trucks are very quiet. It seems to be the rhythm of the engine at certain speeds. It's not super loud - and if the stereo is up or the windows are down, you don't even notice it. But if not, it's a bit annoying. Anyone else notice this? When I was going 65mph this morning, I didn't hear it at all.
 
I don't think so. It has OEM tires and they are pretty quiet - maybe moreso at highway speeds vs. 40 mph. The truck is dead quiet at highway speeds other than the "harmonic" vibration. Very odd.
 
I've had my ZR2 3L duramax for about 6 weeks - and I'm coming from a TRX. I love the truck - but for one (or maybe two?) fairly minor things. The biggest one is what I perceive to be is a bit of "drone" in the 70-75mph range while cruising. It's not the exhaust - as these trucks are very quiet. It seems to be the rhythm of the engine at certain speeds. It's not super loud - and if the stereo is up or the windows are down, you don't even notice it. But if not, it's a bit annoying. Anyone else notice this? When I was going 65mph this morning, I didn't hear it at all.
I've noticed the noise you mentioned at highway speeds when easing into throttle to maintain speeds. I think it has to do with what gear the transmission is in relation to rpm's. When I'm in tow mode towing I don't hear it. It's probably the transmission valve body issue that GM is finally acknowledging. My '21 and '23 did it. And yes good year tires suck!
 
If you get the range DFM module, it will improve this and you won't have cylinders dropping at cruising speeds.

Running in manual gears L8 or L9 help as well.
 
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