I would consider disconnecting the DEM power supply while you troubleshoot, that will isolate the front ( transmission, CV Axles, etc) . There’s nothing likely catastrophically wrong with the angle gear and points aft. I don’t understand why the propshaft would spin with the car not moving but the h...

Once I removed the splash guard it was an easy diagnosis and simple fix - passenger's CV dislodged due to slippage of the half shaft through the carrier bearing. Easy fix because the other 07 is, unfortunately, laid up right now with engine problems. Notice the uniform rust layer on this aftermarket...

It looks like the correct one to me. The aftermarket ones will often not have the same exterior shape casing as the GKN originals. Check length when you have your old one out.

The RH axle passes through the Angle gear casing and all the way into the transmission on the other side. That is why the axle looks so long. The shaft has that extra collar as it is narrower in diameter in the shaft to the original. There is a seal on the RH side of the angle gear and a seal where ...