Rear Axle (Pictures and Video)

[PHOENIX]

Well Saturday I opened up the axle to change the fluid, take a look around, and to determine what gears I have.

Fluid was very old and really needed a changing.
I looked around a little bit and found some damage (see arrow below).
I determined that I have 3.07/3.08 (40 and 13).
The video is nothing special, but shows how the axle works.

Should I be worried about this damage?
About every other tooth on that gear has the side damaged.
It looks like something got stuck in between the gears.
What causes this damage?





Download the Axle Video