MT center diff sealed?

cdlong · 12-06-2024, 04:35 PM

I think the center diff on my manual transmission Impreza failed. I haven't changed the transmission fluid in a long time, 140k miles I think. Should I try changing the transmission fluid first, or just go ahead with (paying someone else to) swapping the center diff? My understanding is that it's a sealed viscous unit so whatever is floating around in the transmission case can't be what caused the diff to fail.

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NickVu · 12-08-2024, 04:43 PM

Correct, it's sealed and old trans fluid doesn't affect it.

TheOnlyKiwi · 01-12-2025, 04:51 PM

Any updates on this post? I have a sneaking suspicion that my center diff is failing on my 09 Impreza 2.5i with the manual transmission.
What led you to the transmission being the issue?

12-06-2024, 04:35 PM	#1
cdlong Scooby Newbie Member#: 147834 Join Date: May 2007 Chapter/Region: RMIC Location: Colorado Springs, CO Vehicle: 2013 Impreza Sport 1995 240sx	MT center diff sealed? I think the center diff on my manual transmission Impreza failed. I haven't changed the transmission fluid in a long time, 140k miles I think. Should I try changing the transmission fluid first, or just go ahead with (paying someone else to) swapping the center diff? My understanding is that it's a sealed viscous unit so whatever is floating around in the transmission case can't be what caused the diff to fail. * Registered users of the site do not see these ads.

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12-08-2024, 04:43 PM	#2
NickVu Scooby Newbie Member#: 27525 Join Date: Oct 2002 Chapter/Region: SCIC Location: Orange County Vehicle: 03 wrx wagon yellow	Correct, it's sealed and old trans fluid doesn't affect it.

01-12-2025, 04:51 PM	#3
TheOnlyKiwi Scooby Newbie Member#: 540020 Join Date: Jan 2025 Chapter/Region: MWSOC Location: Indiana Vehicle: 2009 Impreza hatch Black onyx	Any updates on this post? I have a sneaking suspicion that my center diff is failing on my 09 Impreza 2.5i with the manual transmission. What led you to the transmission being the issue?