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That did the trick! My dealership was out of the Mopar friction modifier, so I just went to AutoZone and picked up K&W Products Posi-Trac Gear Oil Additive. It needed all 7 ounces but now the noise is gone completely! Fingers crossed it lasts. Thanks for the suggestion!

I'll give that a go. Thanks!

Great point! I bought the premixed stuff with the limited slip additive in it already. Think I should add more of the standalone friction modifier on top? Any suggestions on how much to add given the fluid I already used? Just keep gradually adding more until the sound goes away or the diff...

Lol good to know!

Thanks - really appreciate you getting back to me! Yeah my brother's Jeep has about 71k miles on it. It's been making this sound for quite a while now, maybe even a couple years. Until recently, I hadn't driven in his Jeep in quite some time and it's much louder now than I remember it being...

Appreciate you reaching out but my brother already had it at a Jeep dealership multiple times and they fixed nothing. That's the only reason I even got involved to try to fix it. And since it's no longer under warranty, we have little incentive to bring it back to the dealership again...

This is the exact issue my brother is having with his 2020 Gladiator that we're trying to straighten out. Did you ever find a solution? Already changed the rear diff fluid as a hopeful easy fix, but that did nothing. Here's a clip of the noise. It sounds quiet here, but it's actually pretty...