Noise after differential fluid change?

[dross99_si]

How did the magnets look? No flakes, just dust?

Just dust. Nothing crazy.
So strange that the noise occurs only when cold and virtually disappears after a few miles of driving.
Like I said earlier it sounds similar to a manual trans driven in reverse.

 

[swathdiver]

Just dust. Nothing crazy.
So strange that the noise occurs only when cold and virtually disappears after a few miles of driving.
Like I said earlier it sounds similar to a manual trans driven in reverse.

And you're certain it's not coming from the transfer case? Did you say it's coming from the front or rear diff?

 

[dross99_si]

And you're certain it's not coming from the transfer case? Did you say it's coming from the front or rear diff?

I seriously don't feel that its the transfer case. Last time I changed the fluid on that was 2016 (20K miles ago).
Can't tell for 100% sure if it's coming from front or rear. I want to say it's the front though.

 

[swathdiver]

I seriously don't feel that its the transfer case. Last time I changed the fluid on that was 2016 (20K miles ago).
Can't tell for 100% sure if it's coming from front or rear. I want to say it's the front though.

My front axle is/was getting noisy and I started using Lucas Oil in it too. Didn't pay it too much mind. You're welcome to stop by and compare it to mine. Should be home tomorrow. Someone can stand next to the truck as you drive by when cold to see which axle the noise is coming from, or put it up on jack stands and pit it in drive while someone crawls under and has a listen.

 

[dross99_si]

My front axle is/was getting noisy and I started using Lucas Oil in it too. Didn't pay it too much mind. You're welcome to stop by and compare it to mine. Should be home tomorrow. Someone can stand next to the truck as you drive by when cold to see which axle the noise is coming from, or put it up on jack stands and pit it in drive while someone crawls under and has a listen.

Doing that on jack stands makes me nervous hahaha

 

[swathdiver]

Doing that on jack stands makes me nervous hahaha

That's why I mentioned doing it over here with two people. I've got a couple of 3-ton floor jacks and plenty of 3-ton stands, wheel chocks, etc. Even different fluid.

Be forewarned, my youngest daughter and I have a cold still.