Well if it's out of the car its easy to pull apart and check the disk specs. I'm not sure how the disks typically hold up, but i purchased a used differential from an 87 of unknown condition and it was like new inside. Also it's only the s4 t2 that have the clutch style lsd. Other then that, yes shimming it will bring new life into it if it's worn. You don't even need much to add more lockup. I'm sure rebuilding the t2 is cheaper then buying a new os giken if it came to that.
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