Wheel bearing?

[nsk040]

Rear diff mounts were inspected by the tech when the car was up on a lift and he said it was. I think there were 2 mounts, but could only have been 1.

[Dave1027]

I'd think a ruh-ruh noise at 40 mph would not be driveshaft related. My reasoning is because at that speed the driveshaft is spinning much faster than ruh-ruh. A ruh-ruh noise would be more like 4 mph not 40. 40 would be more of a rrrrrr vibration. But who knows? Maybe harmonics plays a part.

When our old 4runner had a u-joint issue the sound was a Vrrrv vibration at about 60 mph.

[Sockethead]

Rear diff mounts were inspected by the tech when the car was up on a lift and he said it was. I think there were 2 mounts, but could only have been 1.

The diff has 3 mounts, two in the front and one in the rear. the rear one has the high failure rate...

[fredo]

My Indy suggested to replace the rear differential bushing. He said it requires 4.5 hours of labor. He also recommended a poly bushing.

He didn’t said there are 2 other bushings in there. Thoughts about going with a poly one ?

[nsk040]

Updated with actual video of noise. Most audible b/w 4 and 6 seconds into the video.

https://www.youtube.com/watch?v=q2uL...ature=youtu.be

[Smolck]

Wheel bearings are easy to diagnose. If the noise goes away when you turn hard one way or the other, it's likely a wheel bearing. Another easy way to test it is jack up the car and spin it by hand with the tire off. You'll hear it if it's bad.

Firehawks arent "quiet" tires. It could just be the tread. Great grip though.

[san]

My Indy suggested to replace the rear differential bushing. He said it requires 4.5 hours of labor. He also recommended a poly bushing.

He didn’t said there are 2 other bushings in there. Thoughts about going with a poly one ?

I went with lemforder when I replaced mine. I didn’t want the NVH to get worse...


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[nsk040]

The noise doesn't vary based on lateral load, as one would think a bad wheel bearing would.

The noise is the same after the new tires vs. before so I don't think its the new tires.

[Smolck]

The noise doesn't vary based on lateral load, as one would think a bad wheel bearing would.

The noise is the same after the new tires vs. before so I don't think its the new tires.

Just saw you posted a video (missed that part last night). That sound doesn't sound like wheel bearings or tires to me. Tough to diagnose that one over the web.....

[SaltyNC]

I think it would be worth inspecting the entire driveshaft (flex disc, center support bearing, universal joint, etc). This is all just speculation, but it's like the suspension is flexing as you drive over an uneven surface (an ordinary road), and that is what explains the intermittent nature of the noise. It sounds rotational, but not constant. I can imagine that driveshaft flexing against a worn center support bearing and making that noise at the lowest position of the driveshaft, and then as the driveshaft returns to its natural resting point, the noise goes away.

Or I could be full of it. ;-)

Salty