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Old 05-12-2003, 12:18 PM   #1
Scooby Newbie
Member#: 325
Join Date: Sep 1999
Chapter/Region: NESIC
Location: NH
2004 STi

Default Noise from the rear bearing or diff?

I think my wheel bearing is going. When the car is in motion I hear a whump whump whump. Coming from the rear. Except I'm not sure if it would be my diff or not?

Is there a way I can verify this ?

If I were to replace my wheel bearing how involved is this and could some provide details. Will I need to press a bearing or anything like that ? I'm mechanically inclinde, but have mostly basic tools in my garage for, like break pads or roter jobs.

Thanks ! Jim
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Old 05-12-2003, 04:18 PM   #2
Scooby Specialist
Member#: 32846
Join Date: Feb 2003
Chapter/Region: MAIC
Location: Elkton, VA
1998 Impreza L-SOLD
Arcadia Green

Default bearing failure

Another good 'ol Subaru wheel bearing post. I just had my left rear wheel bearing go out on me. You can distinguish if its the bearings by jacking up the car, without the emergency brake pulled, grab the tire at the bottom and top and try to shake it. If it moves, say...like the lug nuts are loose, itís the bearings. You should not be able to move the wheel and tire in & out. Yes, the bearing will have to be pressed in, as well, the old bearing must be pressed out. If you have a good vise and mind, you can accomplish this without a press. Go ahead and buy the 3 seals along with the bearing. I got everything from Carquest for $104. A lot of people use Legacy bearings, I have read, b/c they are stronger. I have no knowledge of them b/c I used the O.E. bearings from Carquest. The bearing had "Made in Japan" on it too, this made me feel a little better about the situation. "Made in Taiwan" .

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Old 05-12-2003, 04:18 PM   #3
n00b Moderator
Member#: 811
Join Date: Jan 2000
Location: WA
2000 RS-Ej20G
It tastes like burning


I have been through bum wheel bearings and bad diff bearings at the same time on my celica. I can say that the noises are identical and very difficult to differentiate.

This is what I did; put the car on 4 jackstands such that all 4 wheels were off the ground. Take the rear axles off and run it in gear. If the noise is gone, then it's one of the bearings. Put the axles back in one at a time to figure out which one. If the noise is still there, then it's in the diff.

Likely you have a wheel bearing problem unless you have been running low on diff fluid.

You can also jack up each rear corner and grap the wheel at 12 and 6. If there is any real play, then it's the bearing. If you are not sure, then compare left and right (and maybe front) to see if there is a difference.

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Old 05-12-2003, 05:53 PM   #4
Scooby Newbie
Member#: 325
Join Date: Sep 1999
Chapter/Region: NESIC
Location: NH
2004 STi


Thanks guys... your suggestions have been helpful. I'm gonna give it a shot and see if the wheel shakes any bit.

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