Pulled from my car at 75k miles when I had PuddyMod build me one with 3.63 gears using one of his stock cores.

No clicks or grinds or any other problems. Fluid since 35k miles has been Redline 75W-90. Bushings are still in the housing.

This needs MSM (Mazdaspeed Miata) specific 28 spline axles. Standard 26 spline 1.8 axles don't fit. However mine are still on the car.

Also have the correct transmission speedometer gear sensor thing. This is not required to run the diff but your speedo will be off without it.

Differential (no axles) $600 + shipping
Sensor - $75 + shipping

Buy both and I'll take $700 but cover shipping on my own which is easily $50+ for a differential.

Pictures available on request...but it's a stock diff...not much to show

 

Bumpitybump

 

One last bump for this. I can return it as a core to the builder for $300. Anything above that and it's yours. You pay shipping.