This is a 2004 Mazdaspeed carrier with Giken limited slip with a 3.6 Mazda ring and pinion. The aluminum brace is from Treasure Coast Miata. The notched passenger side has been plated and welded where they break.

These are 2004 Mazdaspeed axles that go with the differential.
This is the OS Giken Super Lock LSD is installed in the diff.

 

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