Before my 89 240 met it's demise a few years ago I had the rear ujoint replaced at a Volvo shop near Collegeville Pa. As luck would have it, I also had the rear ujoint on my 91 240 replaced at the same shop as well. Last summer that rear ujoint with only 20.000 miles decided to go on the 91. While I had the car on the lift I replaced the trailing arms with Super pros poly's and installed the driveshaft from my 89 that I saved. As I have mentioned in previous posts the car developed a vibration over 25mph. I then rebuilt the original driveshaft and again the same vibration! Monday I dropped the original shaft off to be balanced and repaired. Today the shop informed me that the back flange was not true and the ujoint could not be properly seated. Most likely this occurred from too much force being applyed to either removing or installing the new joint. I do remember having the same problem getting the ujoint cap in far enough to secure the lock washer. This leaves me with two questions: is this a common error and problem and can I use the front flange from the 89 240. Otherwise I will be looking for a new driveshft...