Odd Drone Sound 2009 GX470 (1 Viewer)

Joined
Feb 22, 2021
Messages
11
Location
Bonney Lake, WA
I’ve had my 09 GX470 for about a year or 9K miles, and it has been the most quiet vehicle I have ever owned. It has 142K miles. Until now....In the last three weeks it has developed a rather strange droning sound emanating from the front of the car. It gets louder as speed increases but does not go away if the vehicle is slipped in neutral. I took it on a 200 mile trip at speeds of 70-75 miles an hour and hopped out several times to feel all four wheels and none of them were hot. Sunday my wife drove it 200 miles and got 19.7MPG. Yes, she drives like a grandma, so guessing it isn’t a sticking/dragging caliper.

My shop is packed with stuff right now so I haven’t been able to pull the wheels off for a closer inspection. This is my first GX470, so wondering if anyone has dealt with something similar? Guessing next steps are to check diff fluids, and inspect the hub assemblies....

Flame a way fellas. Wish I could be more descriptive with what it sounds like, but my hearing isn’t the best. The sound is noticeable to my friends and family. I am also considering some kind of exhaust leak....?

Thanks!
 
Joined
Jun 5, 2018
Messages
80
Location
New Jersey
Sounds like you're on the right track with checking tires, hubs, and diff fluid. Does the noise change or go away when turning in one direction or the other? If it is an exhaust leak and no CEL is on the dash, you can at least narrow it to after the o2 sensors and before the muffler.
 
Joined
Jan 17, 2005
Messages
5,635
Location
Southern Colorado
My 'mud tire sound' at 45 mph was a bad front wheel bearing. At 60, the wind noise drowned it out, but at lower speeds, it sounded like mud tires - even my wife noticed ;). I drained and refilled the xfer case just to be sure it wasn't full of metal filings, and it wasn't. I later found that (right before I bought the truck) Lexus diagnosed a bad front wheel bearing that was never replaced. I used a Dorman cheapie complete hub/bearing set (Rock Auto) and it has worked fine so far. Front wheel bearings on these vehicles don't seem to last forever, unlike some other Toyota products.

I'm not sure my bearing was bad enough to create a hotter wheel, but you're checking the right things.
 
Joined
Mar 9, 2020
Messages
140
Location
NYC
Same as @SteveH
Right front bearing took a dump without making the wheel hotter than others, or odd driving characteristics, just growling noise. Very easy to replace IMO, a new Koyo bearing from eBay did the trick.
 
Joined
Dec 30, 2017
Messages
108
Location
Montana
I had a similar drone sound that increased with speed as well. It also got noticeably louder as I turned left on the highway. I bought bluepit preassembled hubs and wheel bearings and put them in this weekend. Super easy job for both sides, took maybe 2 1/2 hours taking my time. I also did new rotors and pads while I was there too. Fixed all my issues and is quiet as can be again.

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