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Old 12-02-2012, 01:18 PM   #1
toupedave
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Default Strange rear end noise..

I have a 2000 jdm v6 gc8. Ever since i bought it there is a loud noise coming from the back end of the car, it gets louder with speed increase. I have checked for wheel bearings, they all appear to be good (might be mistaken). I suspected it was the rear diff, so i drained it and took a peek inside and everything is good, no metal shavings on the drain plug. I put some high end diff fluid back in just to be safe, could it possibly be the actual bearing in the diff? I have been living with this noise for about a year now and i would like to not get a headache when i drive with the windows up haha.
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Old 12-02-2012, 04:37 PM   #2
elislider
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is it a droning mild grinding noise? if so, its probably the wheel bearings
if its more clicking or a single repetitive noise, it could be the axles
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Old 12-03-2012, 02:43 AM   #3
toupedave
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Yeah its more of a droaning noise, getting louder with speed increase.
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Old 01-23-2013, 12:24 AM   #4
Duncanjb17
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Check pinion bearings and side diff bearings
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Old 01-23-2013, 03:27 AM   #5
toupedave
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Im probably just gonna replace the entire rear diff assembly. Just gotta figure out which gc8 rear diff fits and works...
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Old 01-23-2013, 08:00 AM   #6
Poppie
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How did you check the wheel bearings?
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Old 01-23-2013, 08:39 AM   #7
toupedave
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Quote:
Originally Posted by Poppie View Post
How did you check the wheel bearings?
Stuck it on a lift and turned each wheel by hand. Listening for any noise or any resistance that was abnormal. Kinda tough with the differentials, but i couldnt make anything to be out of the ordinary
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Old 01-23-2013, 12:38 PM   #8
Poppie
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That's fair enough ,as I've recently had my bearings done and that was the way it was tested as the 'gripping top and bottom of wheel and wiggling' didn't show any signs of them being knackered.

Perhaps if you can post a video of the noise may help as internet diagnosis can be hit and miss imo.
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Old 01-23-2013, 10:34 PM   #9
toupedave
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Originally Posted by Poppie View Post
That's fair enough ,as I've recently had my bearings done and that was the way it was tested as the 'gripping top and bottom of wheel and wiggling' didn't show any signs of them being knackered.

Perhaps if you can post a video of the noise may help as internet diagnosis can be hit and miss imo.
Good point, ill get around to doing that
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Old 02-07-2013, 10:10 AM   #10
Modollenroc
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sounds like the noise my miata made. When we pumped different fluid into it it leaked out and the noise was the bearings and gears whining due to the lack of lubrication and so I drove to buy a used one 70 miles away. as soon as I got off of the freeway on my way back home the diff had failed and the gears were welded together. . . I just went off on a tangent. Nevertheless, fill it with diff fluid to see if it seaps out.
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Old 02-09-2013, 02:47 AM   #11
toupedave
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Quote:
Originally Posted by Modollenroc View Post
sounds like the noise my miata made. When we pumped different fluid into it it leaked out and the noise was the bearings and gears whining due to the lack of lubrication and so I drove to buy a used one 70 miles away. as soon as I got off of the freeway on my way back home the diff had failed and the gears were welded together. . . I just went off on a tangent. Nevertheless, fill it with diff fluid to see if it seaps out.
When i changed the fluid about 4 months ago, it had the proper level of fluid. So there is no leaking going on
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Old 02-09-2013, 11:49 PM   #12
GGSimpreza
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Sounds like the diff to me. Under acceleration only, hum that increases with RPMs? Drops and rises again when changing gear and accelerating again?
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Old 02-10-2013, 01:29 AM   #13
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Do you notice the sound seeming to come from one side or the other or does it seem more centered... also is it like a gear whining sound that is louder when accelerating? If it were the rear end you could play with the load while driving and change the sound. Give it gas and let go and you will notice a change in the sound.
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Old 02-10-2013, 03:04 AM   #14
toupedave
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Quote:
Originally Posted by blkgm8 View Post
Do you notice the sound seeming to come from one side or the other or does it seem more centered... also is it like a gear whining sound that is louder when accelerating? If it were the rear end you could play with the load while driving and change the sound. Give it gas and let go and you will notice a change in the sound.
Thats a good point, the noise is consistent with speed, cant really determine which side. Sounds more the center and regardless if on or off the gas in gear or not, the sound is there
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Old 02-11-2013, 05:18 PM   #15
robinson
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What kind of tires do you have in the rear? Are they different than the front tires? If so, try swapping the front tires to the rear to see if the noise follows the tires.
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Old 02-12-2013, 06:03 PM   #16
toupedave
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Originally Posted by robinson View Post
What kind of tires do you have in the rear? Are they different than the front tires? If so, try swapping the front tires to the rear to see if the noise follows the tires.
It isnt the tires. Gone through three different sets, the noise is always there. No rubbing or anything of that sort
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