Well, that's it. Done all four now within the last year or so, so hopefully they'll last a bit without needing doing again.
However ... the front UJ of the front propshaft had one of the roller bearing races completely dried out and devoid of grease. The one I replaced it with I filled with grease by hand before assembling the propshaft, then when I'd got reassembled it to the Disco I tried to add a bit with the grease gun, but it only came out of one node of the four-way UJ. What's the likelihood that this one will go the same way as the other?
I do try to keep them greased but it seems pointless if I'm only greasing one and the others are just going to lock up and dry out anyway.
Are there other UJ's that are better/more reliable than GKN's?
We do a lot of off-roading but like I said they're cleaned/greased after almost every run out, at least every fortnight anyway, but this almost seems pointless if it's not being greased correctly.