You cant just replace the U joint, MB says you must replace the entire drive shaft I just did a center support and believe I remember my U joint being "sticky" in the center.
A GOOD drive shaft could replace the U joint if need be .

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"