whistling/Humming sound at 40mph, only during acceleration

[bunchz71]

sound goes away in 4wd

Same as mine. I think it’s the noise on the front differential. I am fixing mine soon. I will let you know if it solves the problem.

 

[HACK BLOCK]

I just checked my front diff today and it was about half quart low. I just topped off and gonna check for noise tomorrow

 

[bunchz71]

I just checked my front diff today and it was about half quart low. I just topped off and gonna check for noise tomorrow

Let me know. I changed mine. Mine has made noise since I have changed my gearing from 3:73 to 4:56. I was hoping it was just a break in period but still does it. The noise was non-existent before the gear change.