Glad it's fixed, Shane. What did they do? Do you know if they cleaned & regreased the joints and put new rubber boots at fore and aft (which are integral parts of the NLA $1600 prop shaft assembly)?
Steve, if I understand correctly the u-joints are the ball/cage type like the CV joints, so nothing pressed in = even easier to fix; again precious little info since it's only available as an assembly; replacement parts new are unobtainium. Bentley cautions against flexing the shaft more than 8 (?) degrees or allowing it to compress or extend during shipping/installing.
I am replacing the prop shaft on my 2004 A8L due to physical damage (chasing deer through the yard; I know...) and there is not a lot of info out there (which, in a way, is good - means they seldom fail), so thought I'd chime in for future searchers.
I sourced one at car-part.com (junkyard search engine, essentially), which had a few listed (@ $250 to $350 to "call for price", plus estimated $100 freight) but not many; miraculously it was only 17 miles away! A friend who is an experienced VW tech works at a $tealer service dep't, said he'd never seen either the center bearing or either end fail except when damaged in a collision (including one between drive and concrete when some sloppy tech dropped the thing while removing for other work). Said leave the old grease unless it's contaminated w/dirt on the ends and the center bearing should be OK. I had considered taking it to a local driveshaft shop (there are surprisingly many in Nashville) and having it "gone through". So I'll get out the grease needle and purge out as much old grease as possible via the open ends (only open on the outer-facing flanges) and a laser level in lieu of VWAG Alignment Fixture 27b/6-49 to hopefully put it on straight (don't have a dial/runout gage nor the balls/ability/stupidity to safely turn all four wheels while I lay under the car if I understand the procedure correctly). My mechanic friend says it's not rocket surgery. And if there is a future problem, I have the luxury of having my OE 91K miles shaft I could attempt to repair, or have repaired.
Ciao,
Tom