Maybe you know this already, maybe you dont. But after tearing this thing apart, I have realised that the axle stub is free to move around. What locates it is the CV axle. When you plug your CV axles onto this output shaft, the outter shell of the CV axle that also goes inside of the transmission is captured in a cup, and that cup is what holds the outside of the CV shaft steady. And by doing that, the CV axle will then hold the output shaft steady. So, when you take your CV axle out, and the output shaft of the transmission is wiggling all around, dont worry about it... its completely normal.