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Having removed the front extension from the diff, I found the bearing was making a horrible griding noise. So the only thing for it was to dismantle the extension housing and replace the bearing.
To do this, I first removed the drive flange and the first of the two circlips. The operations manaul then tells you to “tap out the bearing” by inserting a drift into the hollow end of the quill shaft. Easier said then done. Even with a very large hammer and plenty of WD40, it took me quite a time to ease it out without damaging anything in the process. My first “give it a big wack method” didn’t work. I had to move it out a few millimeters, push it back, more WD40, and repeat several times.
Once out, I took the opportinity to clean up and repaing the housing ang the drive flange, before fitting a new baering and reassembling. Looks and feels like new now.