I do NOT want assets. How can I make tank tracks in unity?

How can i make tank tracks that when exported to unity actually work??? they seem to stop rolling when in unity if the curve is not applied in blender.

I have a bone that controls the rolling of the treads on my tank, and the curve is not applied to the treads because otherwise it wouldnt rotate at all, it would be stuck. the bone is parented to the tread so whaen it is moved the tread rotates, when i import the model to unity, the tread just floats off the tank as the bone moves instead of rotating like it does in blender.

I think you’re asking multiple questions. For starters, Blender has a slightly different axis system then unity3d(by default) Are you facing and issue with things being 90 degrees off?