With my limited history on my Project Miata, the team over at TrackPrep Performance said I should tackle changing the differential and transmission fluid. The task is pretty easy but there are a few tips that are very important to follow. Be sure to undo the fill plugs first when you do the transmission and the differential fluids. This will make sure that you can indeed take them out before draining the drivetrain and not be able to fill it back up.

Visit TrackPrep Performance in the links below to order your differential and transmission fluids.

Differential Fluid- RED LINE 75W90 GL-5 GEAR OIL
https://trackprepperformance.com/coll...

Transmission Fluid- RED LINE MTL 75W80
https://trackprepperformance.com/coll...