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Old 01-09-2011, 03:52 AM   #1
The G.O.A.T.
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Default 2007 2.5i rear diff ratio?

just a quick question.
What is the rear diff ratio on a 2007 2.5i, and what years of diffs would work from WRX's/STI's?
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Old 01-09-2011, 04:16 PM   #2
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trans/driveline forum, n00b
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Old 01-10-2011, 02:11 AM   #3
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3.900.

No STi rear diff will work.
No WRX (complete) rear diff will work.


You could transplant the VC LSD unit from inside the rear diff of a WRX into the rear diff of a RS, but why would you want to? The VC LSD units are crap.
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Old 01-15-2011, 08:11 PM   #4
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I have a 3.9 Sti r180 that's going in my 2.5i in the spring. Why would this not work if my stock diff is a 3.9?
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Old 01-15-2011, 08:15 PM   #5
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Quote:
Originally Posted by SubIELove View Post
I have a 3.9 Sti r180 that's going in my 2.5i in the spring. Why would this not work if my stock diff is a 3.9?
With a sufficient swap, yes, you could change the entire rear end and put in an R180. However, you'd need to determine how much of the mounting hardware, rear subframe, etc, you'd have to change to get the R180 in there.

Most people, when they ask what you did, want to know if it's a direct bolt on or if they can swap internals, etc.
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Old 01-15-2011, 08:22 PM   #6
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My full setup will be the v8 Spec C STi 3.9 2 way plated diff and axles, and 04 Sti full hub assemblies. I also have the 5x100 rotors from the spec c. Pretty straight forward bolt in affair.
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Old 01-15-2011, 08:25 PM   #7
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Well, for most people, diff, axles, knuckles, brake assemblies, etc all at once doesn't count as straight forwards. To me, that's "Tuesday afternoon", but for most people that's "hire a mechanic".

Have you confirmed the R180 has the same bolt pattern on the snout as the R160?
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Old 01-15-2011, 08:29 PM   #8
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It doesn't, the snout ring needs to be replaced in favor of the r160 ring to keep the stock driveshaft. The splines are identical on both snouts and the rings are interchangeable. This is a fairly involved job, will most likely take me a weekend. Pretty straight forward bolt in job. I'm converting the car to RWD using an old school Chip Torque Australia center diff spool as well.
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Old 01-15-2011, 11:28 PM   #9
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No, I mean the bolt holes for securing the snout of the main casting to the carrier.
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Old 01-16-2011, 12:42 AM   #10
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Yeah it's all the same, all gd's use the same rear subframe.
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