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Old 11-19-2015, 01:57 AM   #1
Kevinsmith312
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Member#: 380680
Join Date: Feb 2014
Location: washington
Vehicle:
2006 Impreza 2.5i
navy blue

Default Lifespan of Center DIfferential

What is the lifespan of the center differential. If its any consolation my vehicle is a 5mt 06 2.5i. I know that the center diff is shares a reservoir with the transmission and front differential, and that there is silicone fluid sealed in the center diff. I also know this fluid does last a long time and will slowly lose the properties it needs so slowly my vehicle will become one wheel drive (since i have no front or rear LSD). Things that are bad are tons of wheel spin and that once this fluid goes bad the center diff just needs to be replaced. So my question is how long does this stuff last, what is a long time? I have almost 140k miles. I like snowboarding and i don't really wanna go up into the mountains with just 1 tire spinning.
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Old 11-21-2015, 10:11 PM   #2
MrH
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Ice Silver

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I have 250000 miles on my '00 2.5RS and it still works. I ski up tin VT where there are piles of snow.
Get good winter tires.
Buy the tires in 4s.
Keep them rotated.
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Old 11-25-2015, 12:45 AM   #3
Kevinsmith312
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check check check! sweetness good to hear! I'm pretty good on some all season tires with good tread
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Old 02-14-2018, 06:17 PM   #4
car_freak85
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Join Date: Dec 2001
Chapter/Region: NWIC
Location: Cascadia
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EA63 , EA81T, EJ20G,
EJ205

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The original factory center diff in my 2002 WRX seems to be giving up the ghost at 137k miles.
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Old 02-14-2018, 09:39 PM   #5
monkeyposeur
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Join Date: Sep 2012
Chapter/Region: RMIC
Location: SLC, UT
Vehicle:
1993 SS
03 WRB GD 205/22T 20G-XT

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Had one center diff go @ 126k. Snap ring came off and muched the transfer gears. Second center diff started to go on my JDM 5mt recently. It supposedly had less than 60k on it.

Not too bad of a job to replace. But the center diff is a $500 part.
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Old 02-15-2018, 01:37 PM   #6
car_freak85
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EJ205

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Quote:
Originally Posted by monkeyposeur View Post
Had one center diff go @ 126k. Snap ring came off and muched the transfer gears. Second center diff started to go on my JDM 5mt recently. It supposedly had less than 60k on it.

Not too bad of a job to replace. But the center diff is a $500 part.
Doesn't the factory procedure ask you to pull the trans and stand it up on end? I've read people do it in-car also...
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Old 02-20-2018, 02:45 AM   #7
monkeyposeur
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03 WRB GD 205/22T 20G-XT

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I didn't read the FSM procedure for this job. Just watched some youtube videos. I don't see why you would need to pull the trans. If I was going to pull the trans I would have just swapped in a 6mt at that point since it would be about the same amount of work, although more $$$ of course.

I was even shopping for a 6MT but decided to just replace the center diff in the end.
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Old 02-20-2018, 03:47 PM   #8
mrsaturn7085
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WR Blue

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You don't need to pull the transmission, but the upper bolts on the rear extension case are not at all easy to remove/install due to the proximity of the transmission to the transmission tunnel. You also need to clean and re-apply gasket former to the extension case during reassembly... and this is challenging with the transmission in, to say the least. Lastly, the 4 split bearings have to stay on the shaft when you install the c.diff itself... this can be challenging as well.
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