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Old 10-15-2002, 08:48 PM   #1
BrysImpreza
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Default How do you check the fluid in the rear differential?

My car has this aweful noise coming from the rear over 30 MPH, I'm guessing it's either the rear axle bearings or the differential.. DOH!

Either way, how can I check the fluid in the rear differential?

Bry.
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Old 10-15-2002, 09:06 PM   #2
SJwrx
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Park it on a level surface, AKA 1/2 way out of the drivway. Use a 1/2 inch wrench to pull the top bolt on the rear diff.. On a perfecty level surface, you should be full of diff. fluid until it starts dripping out the top of the top hole. Thats how much. So, thats it.

Might as well change out the fluid while you are at it.

Rich
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Old 10-16-2002, 04:53 PM   #3
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i just changed mine out last weekend, 11800 miles and it was disgusting. i couldn't even imagine what it would look like at 15k. i probably would have changed mine out closer to 10k. it's really cheap, you should just change it out.
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Old 10-16-2002, 05:03 PM   #4
BrysImpreza
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What do you change it with, standard Gear Oil? Brand, type, etc?

Bry.
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Old 10-16-2002, 05:08 PM   #5
tdxflex
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i used Redline 75w90, bought it for $8 from summit racing along with other stuff to save on shipping. you can also use a 1/2 ratchet for the bolts. mine were on really tight, i actually used my 1/2 breaker bar for extra leverage over my ratchet.
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Old 10-16-2002, 07:13 PM   #6
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Quote:
Originally posted by tdxflex
i just changed mine out last weekend, 11800 miles and it was disgusting. i couldn't even imagine what it would look like at 15k. i probably would have changed mine out closer to 10k. it's really cheap, you should just change it out.
Mine was "disgusting" at 3,000mi. Made me cringe to look at it. I changed it at 15k again and it was a clean as new. Considering I used synthetic I may not change it for a while.
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Old 10-16-2002, 07:16 PM   #7
BrysImpreza
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damn, my bolts have square holes, so I can't use a wrench or hex wrench
Maybe I'll just ahve subaru check it when I bring it in to have my wheel bearings changed

Bry.
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Old 10-16-2002, 07:22 PM   #8
tdxflex
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yeah, a 1/2" drive wrench fits in there fine. it's actually a little on the small side, but it works fine.


Quote:
Originally posted by BrysImpreza
damn, my bolts have square holes, so I can't use a wrench or hex wrench
Maybe I'll just ahve subaru check it when I bring it in to have my wheel bearings changed

Bry.
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Old 10-31-2002, 04:57 AM   #9
SJwrx
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smells like crap too!
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Old 10-31-2002, 10:31 AM   #10
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I don't believe that the dark fluid in the differential is actually dirty, when I drained mine at 3500 it looked the same as everyone is describing here, but I think it's from additives used in the fluid at the factory and not contamination. I'm willing to bet that if the diff fluid was drained from a car with zero miles it would look the same.
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Old 10-31-2002, 11:31 AM   #11
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I have to agree with Mulder. I believe factory recommendation for change rear diff fluid is either 30k or 60k miles.
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Old 11-14-2002, 02:44 PM   #12
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Quote:
Originally posted by Foxbat
I have to agree with Mulder. I believe factory recommendation for change rear diff fluid is either 30k or 60k miles.
unless you drive hard like most WRX owners do, in which case the factory recommendation is to change every 15000 miles (severe driving maintainence schedule).
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Old 11-14-2002, 03:41 PM   #13
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BrysImpreza,
have you ruled out the possibility of a bad wheel bearing?

Quote:
I don't believe that the dark fluid in the differential is actually dirty, when I drained mine at 3500
I changed my tranny and differential fluid at ~12K. There were more of the fine metal pieces on the magnetic drain plug of the differential than on the tranny's drain bolt, which is not what I would have intuitively guessed. I would have guessed the opposite, given the greater volume of fluid and more moving parts in the transmission as compared to the rear differential.
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