Since that axle gear meshes with the two spyder gears, there has to be some way this gear is "controlled" by design. On stock set ups the axle gear fits into a precision recess. This has to be similar to the unit you have, except parts or something is missing. Without this control the spyder gears would have incorrect mesh/lash.

I can't imagine someone would design that gear to flop around like that as the mesh with the spyder gears and the thrusting apart of these gears is what applies the force to lock the carrier up either with clutches or cone or whatever.

If you take it apart please let us know what you find. Best of luck to you.