Noticed a new rattle from the front end about half way through my last ride. Seemed to be based on vibrations / RPM’s. No rattle at idle but chatter around 2500 RPM’s. Got out and moved things to try to find it and found this in the front joint behind the differential. Shaft going into the diff is solid, the movement seems to be up and down and in the shaft going to the rear. Due for its 100 hour service and am fearful this will be costly. Anyone have experience? I understand that you can’t just replace a U-Joint but rather the whole drive shaft has to be replaced. Thanks!