2006 TRX350 4×4 no drive up front…?

Hi Chaps,

Here’s another one for you:

I noticed my TRX350 FM6 doesn’t have any drive to the front wheels. The propshaft/driveshaft turns when driving all the time, but it doesn’t drive anything up front.

Would it be the splines in the cup joint just in front of the front diff that have worn/sheared, or could something else more sinister be afoot?

Thanks in advance