Howling at 70mphs

[Mpittmanfl]

Ok. I’ve been trying to isolate a “howling” noise at around 70mph. It sounds like when a mechanical fan kicks on, but while driving it is very hard to isolate if it’s from the front, left, right, rear, I just can’t tell. I’ve checked wheel bearings, brakes, diff, etc. anyone had this sound before?

 

[Tremper126]

More than likely the rear pinion bearing. Mine does it primarily when I’m coasting and gets louder at high speeds and quieter as I slow down. Drove me nuts wondering but 70k and it’s still holding on lol

 

[Mpittmanfl]

Thank you, thats been on my list as well. It just started out of the blue a few weeks ago! Drives me NUTS!!

 

[GuyNeco3]

I had the same problem a mechanic told me it was the turbo the sound for me was after 60 going up hill and would quiet after 80?( Sometimes)This happened after I did the total delete kit.

 

[Mpittmanfl]

I had the same problem a mechanic told me it was the turbo the sound for me was after 60 going up hill and would quiet after 80?( Sometimes)This happened after I did the total delete kit.

I did my delete 2 years ago and this is new. I’m going to verify that it’s not the axle seal/bearings and then move to pinion.. fun times to be had for sure!

 

[GuyNeco3]

Thanks I’ll let you know if it fixed my problem after I tested out my truck this weekend? Good luck with your investigation.