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Subaru STi Differential Identification

Black Pearl

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Hello all, 


I'm doing a STi limited slip differential swap into my 1978 280z, and I was wondering if someone could help me identify my STi differential.  I was told it was out of a 2008 STi which would make it a 3.54 gear ratio with a Torsen limited slip unit, correct?  I cannot find the gear ratio stamp on the ring gear where others have shown it located.  Also, does it look like it has the Torsen LSD unit?  Any help is appreciated!














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It is a limited slip of some sort with the 2 piece case based on the seam on the ring gear flange. It looksl like it has helical gears like a Torsen to me. I've never seen a ring gear that didn't have anything stamped on it, so rotate it around and look for markings where that yellow paint mark is now. Otherwise, with the the cover off, count the teeth on the pinion gear and count the teeth on the ring gear. Divide the pinion into the ring and that's your gear ratio.

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