U-joints on the Aluminum Driveshaft

The Shape

Founding Member
Jan 11, 2002
2,224
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East ARKANSAS Delta
I was wondering if the the u-joints on the Ford Racing aluminum driveshaft or greaseable? I am thinking they are sealed and you can't grease them , but I can't remember for sure and figured asking you guys would be easier than jacking the car up and climbing underneath to check. :D

I have been hearing a small clunk sometimes lately when my car downshifts while coasting. I was thinking u-joints, but my aluminum driveshaft is only 2 years old. It could be my AOD's TC as well, but figured I would check and see if maybe I just need to grease the u-joints.