Greetings,
It seems as though the u-j on my 76 300D is on its way out. There is vibration only at start from a stop for the first couple of miles an hour and then there is no other indication at any other speed thereafter of any problem. There is no noise either. The vibration seems to come from the center of the car in the general vicinity of the tunnel.
Car has 392,000 miles on it, as far as I know, the d-shaft has never been serviced. In the last two years, motor mounts, engine shocks and tranny mount have been replaced, sub mounts as well.
Car runs well in all respects, but I had the mechanic look at that driveshaft. From him comes the word on the frayed state of the U-joint.
He recommends removing the driveshaft and sending it out to a shop that rebuilds them with american style u-joints. I don't know how much that will cost yet.
I suppose at this mileage there is no doubt, but how can I check the uey at home? And what are my other options? I had browsed the archives and it seems the two options are either a rebuilt unit or the mod with the non MB U-joint.
I want to do the German thing and keep the car as original as possible.
Thanks for the advice.

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63 220S W111
76 300D W115
2013 VW JSW TDI M6

previously-
73 280 SEL 4.5
86 300E 5 speed
2010 VW Jetta TDI M6