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4x4 growling noise

My 1999 silverado growls in when it’s in 4-Hi. It seems like it only happens when I accelerate. And it’s only in 4WD, not 2WD. So I’m worried about the front differential, especially since I just got a bunch of seals replaced and read that problems with the front diff can make them go bad. Did the shop just ignore a likely problem?

I just bought the thing last summer, so I’m not sure if the sound changed much over time. I do need front shocks, that doesn’t seem related, does it?

It should make some noise. My 2002 makes 4WD noise but I ignore it. If you are worried, have the fluid level checked.