whirring/roaring noise from rear

[dixie_boysles]

I've got a whirring/roaring noise (not high pitched, kind of a low whomp/whirring/roaring best describes it) coming from the rearnof my 06' Sport. Mostly hear it at low speeds (10-35 mphs). Can really hear it on deceleration like coming up to a stop sign or light. At highway speed (around 55 mph) its mostly a him and 65+ can't really tell it's there.

I've got new tires and it done it before with old tires, so ruling that out. I had my mechanic check it out thinking it was wheel bearing and he thought it was my wore BFGs , but again, I've since got new tires with the noise is still there.

I'm leaning towards either low or old rear diff oil OR pinion bearing. Plan on refilling rear diff with some full synthetic to see if it quitens any. What are the symptoms of a bad pinion bearing?

Its got 155k miles.

 

[robaroni]

I get that all the time. Just cut back on the beans. :banana:

Just kidding! Sorry buddy!

 

[KidVermicious]

What are the symptoms of a bad pinion bearing?

Whining/roaring from the rear diff :thumb:.

Check your fluid. If it's low or superdark, drain and fill (and look for metal fragments - little chunks or a whole bunch of silvery sludge are no bueno, but a little bit of sludge is fine). If the fluid looks good, or changing it doesn't help the noise, I'd drop the third and take it in to a driveline shop to get checked out. If it's just a bearing, addressing it now might save you having to buy new ring and pinion. On the other hand, if your gears themselves are toast, replacing them now might save your entire third grenading on the freeway.

 

[dixie_boysles]

Whining/roaring from the rear diff :thumb:.

Check your fluid. If it's low or superdark, drain and fill (and look for metal fragments - little chunks or a whole bunch of silvery sludge are no bueno, but a little bit of sludge is fine). If the fluid looks good, or changing it doesn't help the noise, I'd drop the third and take it in to a driveline shop to get checked out. If it's just a bearing, addressing it now might save you having to buy new ring and pinion. On the other hand, if your gears themselves are toast, replacing them now might save your entire third grenading on the freeway.

Just had a quote for replacing the bearing if I bring in 3rd member----$300 + parts. Hoping it's just fluid lol

 

[KidVermicious]

Just had a quote for replacing the bearing if I bring in 3rd member----$300 + parts. Hoping it's just fluid lol

That's not a horrible quote actually, you have to have a hookup to get much lower than that.

If it's bearings, a master install kit will run you around $150, depending on brand and where you buy it. If you need ring and pinion too, figure another $150. Rons Machining has an EBay store with some good deals on Yukon and USA Standard gears and bearings.

Another option is a junkyard third - 4.10 V6 thirds go for $100 around here if you find somebody parting out, a little more if you get them from a wrecking yard.

 

[dixie_boysles]

Shot a quick video of it. You can hear it really good from 0:03 to 0:13 Mark and also near the end of video.

06 Runner noise: 06 Runner noise - YouTube

 

[preacher35]

Shot a quick video of it. You can hear it really good from 0:03 to 0:13 Mark and also near the end of video.

06 Runner noise: 06 Runner noise - YouTube

Yeah, I hear it. Man, from the video, it almost sounds like your tires are feathered. You're sure the sound is coming from the rear diff?

 

[Greydog]

My grabber at3s make the same wha-wha-wha rhythmical sound.

The inner line of cleats are worn excessively due to too much camber it seems.

Pull a tire in the end or side of the truck making the most noise, and roll it across the ground my hand. You'll see if the inner or outer ended is worn more than the rest if the tread surface line.

I had mine rebalanced and they are a bit better vibration wise but still noisy.

I think the prior alignment was too aggressive in camber or toe. I was told that its more important to keep those very neutral on large cleat tires. Could be my rear angles are off due to age or the lift.

 

[dixie_boysles]

I've got new tires though, did it with the old tires...

Imma go borrow some mild tires from my Buddha shop off of another 4runner and see if it still makes sound

 

[KidVermicious]

Boy, that could be a lot of things. The first thing I think when I hear that is u joints, have you checked them yet? Look at your u joints for slop, there should be zero play. Try and wiggle your pinion flange while you're down there, see if there's any side to side or in and out play.

 

[dixie_boysles]

Boy, that could be a lot of things. The first thing I think when I hear that is u joints, have you checked them yet? Look at your u joints for slop, there should be zero play. Try and wiggle your pinion flange while you're down there, see if there's any side to side or in and out play.

Yep I've done all that! No play at pinion flange or u joints

 

[sclark231]

I just read this (1/1/2018). Did you ever fix the issue? I am having the same issue with my 2003 4runner sport 4.7L 2WD.

 

[keakar]

I've got a whirring/roaring noise (not high pitched, kind of a low whomp/whirring/roaring best describes it) coming from the rearnof my 06' Sport. Mostly hear it at low speeds (10-35 mphs). Can really hear it on deceleration like coming up to a stop sign or light. At highway speed (around 55 mph) its mostly a him and 65+ can't really tell it's there.

I've got new tires and it done it before with old tires, so ruling that out. I had my mechanic check it out thinking it was wheel bearing and he thought it was my wore BFGs , but again, I've since got new tires with the noise is still there.

I'm leaning towards either low or old rear diff oil OR pinion bearing. Plan on refilling rear diff with some full synthetic to see if it quitens any. What are the symptoms of a bad pinion bearing?

Its got 155k miles.

check your rear brake pads, the inside (the one you cant see) wears out first and may be gone even if you see good pads on outside.

also pull rotors and check the emergency brake pads

whirring noises are "usually" pads worn down to bare metal

 

[BR06run]

Our 2006 Sport had to have the differential replaced. It got really noisy. Toyota differentials don't have covers that you remove and replace individual parts like other vehicles.The whole thing comes out the front of the case,gears,bearings,everything. The dealer will only replace the whole unit and it's not cheap,$2603. You can raise the rear of the vehicle off the ground with it idling in drive and take a stethescope to the case and tell if that is what it is. On ours the bearings were quiet while the center case was grinding away.If you find someone who will replace individuals parts,which will save you money just be sure they know what they are doing.Things like pinion bearing preload,gear meshing are very critical and if not set correctly will cause problems down the road. Good Luck

 

[ray k]

check your rear brake pads, the inside (the one you cant see) wears out first and may be gone even if you see good pads on outside.

also pull rotors and check the emergency brake pads

whirring noises are "usually" pads worn down to bare metal

If it were worn down to bare metal, it would make a lot more than a whirring noise. I had a mechanic tell me my pads were down to bare metal to which I said BS show me because it's not making any noise. When we looked they were pretty worn but not completely gone so when I pointed that out they said "well...they're pretty close". Yeah, I took it home and changed them myself about 5,000 miles later.