I recently started to notice a vibration (I believe in the front driveline) when I am going up an incline and accelerating... I can accelerate on level or downhill, and I don't seem to notice anything, however when I am on an incline and accelerate, there is a very noticeable vibration (again I believe in the front end). Any help diagnosing would be appreciated!!

 

Thanks... I'm assuming that's not easily determined unless there's something actually loose or cracked though...

 

From what we could tell, there seems to be very little movement, although i'm not sure how much there should be. My son and I think that perhaps a driveshaft flex joint could be going bad...any thoughts on if my symptoms could be pointing to that? Is there any way to verify if those are bad, other than something visually be wrong with them? Thanks!