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Old 05-17-2010, 10:02 AM   #1
tittykaka7
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Default LOUD whine from trans / diff while coasting at 60mph? SOLVED!!Read if you have noise!

Hi all,

I've done a bunch of searching lately and most of the problems like this I've found are not the same, most of the time people have a noise similar to this when accelerating and at all speeds. Mine is ONLY happening at 58-65 mph, and is loudest at about 60 when I'm just maintaining speed with a tiny amount of throttle, or when I let off. I can push the clutch in and coast at idle and it still does it. The sound does get higher in pitch as my speed increases. If I accelerate the noise goes away completely. I tried swerving left right and it does not change the noise, so its not a wheel bearing.

Also here is another strange symptom that may or may not be related - at about the same speeds, I start getting a shake in the steering wheel, feels exactly like a wheel weight fell off and one wheel is out of balance - except it comes and goes on its own, and will happen regardless of whether I'm accelerating, slowing down, turning, going anywhere from 55-75 mph. . which is unlike a wheel out of balance since that vibration should be repeatable every time. This is not, it comes and goes on its own without me changing a thing. I can be cruising at 65 mph, have it start shaking pretty good, then after a minute or so it just goes away on its own. 5 minutes later its back etc..

Also I noticed that if I am idling along at 10 mph, and rev the engine a little with the cluth in, then let the clutch out to give the drivetrain a sort of jolt, I can hear something clunking somewhere. Its impossible to tell where these noises are coming from inside the car. The humming or whine noise also seems to reverberate through the whole car, making it impossible to determine its location. Underneath the car is about the best I can say.

I am mechanically inclined, I do all my own work with everthing. But I'm really not sure where to start with this car. I don't want to damage it by driving it like this so I'm desperate to get it fixed as this is my daily driver.

Thanks in advance! Oh and as the title says, whoever is able to diagnose this problem correctly will get $10 sent to them through paypal as a token of my appreciation!
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Last edited by tittykaka7; 12-14-2010 at 07:08 PM.
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Old 05-17-2010, 10:50 AM   #2
kdiggz
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did u use too much NAWSSS? didnt your laptop tell u that u were going to have danger to the manifold?


i dont know what a "whirring" noise is, but when a turbo car makes noise under acceleration u have to assume it's a boost leak. any leaks in your downpipe area? i guess i'm not sure why it would make a noise coasting at idle though so that's probably not it
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Old 05-17-2010, 11:28 AM   #3
tittykaka7
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The noise is closest to that of typical transmission whine except much louder.

You can hear the frequency of the noise to be spinning faster than the wheels turning around, in other words I doubt its anything to do with wheel bearings, half shafts etc. It sounds like a bearing noise from maybe the driveshaft? Are there carrier bearings on the driveshaft of these cars?

Figured I should include this info too:

Car:
2004 WRX Sedan - stage 2 tune
89,000 miles
Transmission was replaced by previous owner at about 30k miles.
Trans and rear diff fluid was replaced by me at 65k miles with Motul 300.
Never ran unequal sized tires.
Car runs, drives, and shifts absolutely perfect at this point - just that this noise is very concerning.
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Old 05-17-2010, 01:18 PM   #4
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Edited title - Willing to pay someone $10 to help me with this!

Can anyone even suggest what to start checking? I'm going to jack the car up when I get home later but am not sure where the best place to start inspecting is.
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Old 05-17-2010, 01:25 PM   #5
FlatironsTuning.com
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If you can, get your car up on a lift, and listen under the car while someone is driving it. I actually just ran into a similar problem (the difference being that when I let off the throttle, the noise went away) and it turned out to be a bad bearing in the transfer case. It was harder to hear while driving the car, but from underneath, it was very obvious.

Good luck, and hopefully it's something simple.
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Old 05-17-2010, 01:34 PM   #6
lh0628
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My bet would be the rear diff/propeller shaft.
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Old 05-17-2010, 04:59 PM   #7
Ernest
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I think it is the diff - some cars have a dampener to try to stop the humming. Does not always work Mine started after I put on poly outrigger bushings.
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Old 05-17-2010, 08:04 PM   #8
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Take the center console out - if it whines from the rear end of the tranny and is speed dependent, it's a transfer case gear.

Just had my 04 WRX transmission rebuilt for the same problem.
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Old 05-17-2010, 10:47 PM   #9
tittykaka7
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Hey guys, have some more info.

I jacked it up and wiggled and twisted on everything, mostly the driveshaft, and nothing feels loose or obviously bad. None of the wheels have any play in any direction so I dont think its a wheel bearing. The driveshaft has almost no play in any direction except for the rubber support by the carrier bearing.

Now on to what we found. I had someone spin the wheels to 60 mph with the car jacked up and dont worry, I didnt go underneath it.. I was too scared. But I listened from the sides and while it wasnt as loud or consistent as when I'm driving I was able to determine is is NOT coming from the front of the car, its definitely either the rear differential or the carrier bearing. Both me and my old man think its the carrier bearing, it sounds loudest from that area. I touched a mechanics stethoscope to the rear diff and could hear the noise, but that could easily just travel up the driveshaft from the carrier bearing.

So I went for another test drive and recorded the noise. See what you think. It only makes the noise when I maintain speed or coast, even with the clutch in and the shifter in neutral. It will do it in any gear but its only loud at higher speeds, but when listening closely I can still hear it at lower speeds contrary to what I first thought.

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Old 05-18-2010, 02:57 PM   #10
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Heres a question - how much heat should come from the rear diff and carrier bearing?

I noticed that both the rear diff and carrier bearing get to about 95-100 degrees after driving. I think the rear diff should have some heat, but the carrier bearing? I don't know but that seems like it should not generate any heat unless the grease has dried up..

I found out it is not possible to replace just the carrier bearing, and that we have to replace the entire driveshaft?! How stupid is that! I'm finding these 3" aluminum 1 piece driveshafts around for like $480, but really don't want to hammer up my undercarriage.. does anyone know where to find a suitable OEM replacement for cheap that does not require any crazy hammering?
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Old 05-19-2010, 11:02 PM   #11
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I've had this car up in the air a dozen times or so. I'm stumped. I've checked EVERYTHING to see if its loose and nothing seems to be. Grabbed all half shafts, driveshaft, wheels, and shook the hell out of everything and nothing moves much. Carrier bearing, front diff bearing, rear diff bearing.. none seem to have any play at all.

I drained my trans fluid and there was no metal shavings on the plug or in the oil. Same for the rear diff. I sprayed pb blaster all over the carrier bearing and rear diff nose where the driveshaft goes in and it didnt help. Now I tried shooting grease into the carrier bearing in the tiny gap on the backside of the rubber mount behind the dirt guard . i'm guessing the bearing is right in there but nobody on this planet has an exploded parts diagram of the carrier bearing assembly..so who knows if the grease is even getting to it.

Only thing I havent tried is spraying the ujoints, I'll give that a shot.
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Old 05-24-2010, 08:04 PM   #12
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I have this same noise in my car and research told me that it was something do with my clutch. either a bad bearing or mount that is causing the clutch to wear unevenly. Maybe you can give that a try
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Old 09-25-2010, 11:56 PM   #13
ohemgeeitsNiko
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you figured this out yet? from what it sounds like, the same problem just popped up with mine. i'm hopeing it's a wheel bearing or something.
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Old 09-29-2010, 10:34 AM   #14
tittykaka7
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Hey guys, I forgot to post my solution to this thread!


It turned out that the rear differential mounts that I was using to put my jack under, have rubber isolating them from the body of the car to prevent rear differential noise transmission - well after jacking my car up 100 times using those mounts, I bent the damn things enough to make contact with my cars body, thus bypassing the rubber mounts, allowing noise to transmit directly into the body of my car turning it into a giant tuning fork!
The mounts I'm talking about are the ones directly in front of the rear tires, with a single large bolt holding the rear diff to the car, then 2 small bolts holding the mounting plate to the car.
I had to take these off and put them in a vice to bend them back so they stopped making contact with my cars body, and just like that, no more noise.

So I bent that bastard back to normal and .. car is quiet as ever! Ohhh man.. what a pain in the ass! The metal that was contacting was seriously like 1/2 inch long by 1/8th inch wide, but it was polished off from rubbing so thats what gave it away.. but who would thought! All that noise from such a tiny thing..
Well thanks anyway for everyones suggestions and help! Hope I can help someone else solve this.. to me, these plates look like a very good place to put your jack and I'm betting other people have done this as well and never found out thats why their noise started!

See attached pic of the mount taken apart:


If you look at that pic, the outside edges of the flat mount had been bent upwards until they made contact with the outside edges of the round metal on the diff mount. Its crazy that much noise made it through for such a seemingly small problem..

Last edited by tittykaka7; 12-09-2010 at 03:28 PM.
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Old 10-01-2010, 01:29 AM   #15
MARKSTIV8
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Wow, that's crazy. After reading your symptoms I was 99% sure that it's the same as mine problem and that's tranny bearings. I have to take those metal plates off and see if that helps!
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Old 11-07-2010, 02:05 PM   #16
MARKSTIV8
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Indeed, I removed the plates and the whine is gone! Amazing.
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Old 11-07-2010, 02:29 PM   #17
MilesToEmpty
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I had a loud bang every time i shifted... turned out the top of the bushing had broken off and the arm was smacking around between the 2 plates.

These things make some strange noises lol.
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Old 11-13-2010, 09:42 PM   #18
Damien02WRX
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Quote:
Originally Posted by tittykaka7 View Post
Hey guys, I forgot to post my solution to this thread!


It turned out that the rear differential mounts that I was using to put my jack under, have rubber isolating them from the body of the car to prevent rear differential noise transmission - well after jacking my car up 100 times using those mounts, I bent the damn things enough to make contact with my cars body, thus bypassing the rubber mounts, allowing noise to transmit directly into the body of my car turning it into a giant tuning fork!
The mounts I'm talking about are the ones directly in front of the rear tires, with a single large bolt holding the rear diff to the car, then 2 small bolts holding the mounting plate to the car.
I had to take these off and put them in a vice to bend them back so they stopped making contact with my cars body, and just like that, no more noise.

So I bent that bastard back to normal and .. car is quiet as ever! Ohhh man.. what a pain in the ass! The metal that was contacting was seriously like 1/2 inch long by 1/8th inch wide, but it was polished off from rubbing so thats what gave it away.. but who would thought! All that noise from such a tiny thing..
Well thanks anyway for everyones suggestions and help! Hope I can help someone else solve this as to me, this looks like a very good place to put your jack and I'm better other people have done this as well and never found out thats why their noise started!

See attached pic of the mount taken apart:


If you look at that pic, the outside edges of the flat mount had been bent upwards until they made contact with the outside edges of the round metal on the diff mount. Its crazy that much noise made it through for such a seemingly small problem..
I must say thank you very much! I have had the gear whine sound for almost 2 years now. I finally took the plate off on the side where the rock I hit was and found it was bent and rubbing. Took it off hammered the piss out of it straight and the noise is gone! You da man, THANK YOU!!!!!
Here is my original thread for my problem:
http://forums.nasioc.com/forums/show....php?t=1854127
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Old 11-14-2010, 09:01 PM   #19
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Its the coast side of your differential ring gear teeth. The noise will go away when accelerating because the pinion isnt putting any pressure on the coast side of the ring gear teeth, which are probably worn hence the whining noise.
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Old 11-14-2010, 09:05 PM   #20
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Nevermind! didnt read the whole thread before posting.
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Old 12-05-2010, 01:30 PM   #21
tittykaka7
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Well I'm really glad what I found helped you guys!
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Old 12-05-2010, 02:57 PM   #22
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Quote:
Originally Posted by MARKSTIV8 View Post
Indeed, I removed the plates and the whine is gone! Amazing.



d000000000000d

ya gotta have the plates.....just cant have BENT ones that touch where they shouldnt
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Old 12-08-2010, 08:36 PM   #23
tittykaka7
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Quote:
Originally Posted by Uncle Scotty View Post



d000000000000d

ya gotta have the plates.....just cant have BENT ones that touch where they shouldnt
LOL Didn't notice he said that, I assumed he replaced them after bending them straight. Driving without them will obviously leave the front of the differential unsupported, allowing it to sag down and undoubtedly ruin the prop shaft / carrier bearing / rear diff & probably a bunch of other stuff! I hope he did put them back on!
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Old 12-09-2010, 03:30 AM   #24
ryanc686
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I have a verrry similar sound coming from my car at the exact same speeds. I am going to check this **** out now.
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Old 12-09-2010, 03:51 PM   #25
feint05
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Quote:
Originally Posted by tittykaka7 View Post
Hey guys, I forgot to post my solution to this thread!


It turned out that the rear differential mounts that I was using to put my jack under, have rubber isolating them from the body of the car to prevent rear differential noise transmission - well after jacking my car up 100 times using those mounts, I bent the damn things enough to make contact with my cars body, thus bypassing the rubber mounts, allowing noise to transmit directly into the body of my car turning it into a giant tuning fork!
The mounts I'm talking about are the ones directly in front of the rear tires, with a single large bolt holding the rear diff to the car, then 2 small bolts holding the mounting plate to the car.
I had to take these off and put them in a vice to bend them back so they stopped making contact with my cars body, and just like that, no more noise.

So I bent that bastard back to normal and .. car is quiet as ever! Ohhh man.. what a pain in the ass! The metal that was contacting was seriously like 1/2 inch long by 1/8th inch wide, but it was polished off from rubbing so thats what gave it away.. but who would thought! All that noise from such a tiny thing..
Well thanks anyway for everyones suggestions and help! Hope I can help someone else solve this.. to me, these plates look like a very good place to put your jack and I'm betting other people have done this as well and never found out thats why their noise started!

See attached pic of the mount taken apart:


If you look at that pic, the outside edges of the flat mount had been bent upwards until they made contact with the outside edges of the round metal on the diff mount. Its crazy that much noise made it through for such a seemingly small problem..

FAUK why did i see this soo late
you get the same noise from installing rear outrigger bushings, ask me how i know, anyway the r160 diff makes a whine at those speed you hit it right on the head, so my suggestion would have been to check those bushings
FAUk(pronounced FAACK)
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