center diff swaping

logan9691 · Post by **logan9691** » Wed Nov 18, 2009 6:43 am

can you swap the center diff from a '91 legacy MT to a 2002 WRX MT to keep the 3.9 rear diff?

adema2626 · Post by **adema2626** » Wed Nov 18, 2009 9:37 am

Nope you can't sorry to say. The center diffs are different. Your center diff is a phase I and a WRX center diff is a phase II diff.

Isn't the wrx one 3.54, 3.45 or something I forgot which one. Some one else I'm sure will jump in.

There is a thread around here showing the difference between the center diffs.

93forestpearl · Post by **93forestpearl** » Wed Nov 18, 2009 4:32 pm

The transfer gears are 1.1:1 to make rear need the 3.545.

206er · Post by **206er** » Wed Nov 18, 2009 5:18 pm

will the transfer gears physically work in the 3.9 tranny? if so you could do this swap if you want to run a wrx rear diff too. 1.1*3.545=3.9

93forestpearl · Post by **93forestpearl** » Wed Nov 18, 2009 5:45 pm

I couldn't tell you. I haven't taken a newer trans apart, and it's been almost ten years since I disassembled an old 5mt.

It's not that hard to swap a ring and pinion on a rear diff.

logan9691 · Post by **logan9691** » Wed Nov 18, 2009 6:51 pm

Can't you take the transfer gears from the SS 5mt and put them in the WRX 5mt?

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center diff swaping

center diff swaping