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Old 05-02-2004, 11:41 AM   #1
Joker 13
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Member#: 38669
Join Date: Jun 2003
Vehicle:
2008 FSXT
WRB

Default Operating temp of STI rear diff?

I just did a 6spd conversion on my WRX with an STI tranny with DCCD. I'm wanting to know what the operating temperature is of the rear diff, so I know what temp range of gauge to buy. On the STI all the gauge cluster says is "hot" when it gets hot, it doesn't have a degree measurement. If anybody had any suggestions on which gauge to buy (tranny temp, oil temp, etc) and what temp is "hot" that would also help.
Thanks
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Old 05-04-2004, 08:07 AM   #2
Joker 13
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Anyone?
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Old 05-05-2004, 08:07 AM   #3
Joker 13
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Thanks for the info, but I figured it out. Here it is in case anybody else needs it. Normal operating temp is 150-200'F. "Hot" is considered 250'F.
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Old 10-10-2018, 02:39 PM   #4
Crazyced
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World Rally Blue

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Sorry to bump a ridiculously old thread. But I've been looking into this and figured I would share info for others landing on this thread.

Here's what the 2004 Factory Service manual says:
Quote:
Soak the sensor in oil, then raise the oil temperature. Check that the continuity is cut off when the oil temperature is between 144C (291F) and 156C (313F). Then, check that the continuity resumes by the time the oil temperature drops to 135C (275F).
Seems like Subaru deems the diff 'Hot' when it reaches around 300F.
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