Originally Posted by TheFix
...are any of the u-joints that have a lubrication zerk worth considering?
In my personal opinion... if you do lots of deep soupy mud, yes. If you don't do much mud, I personally would not run a greasable u-joint. Well technically I do run a greasable u-joint but it's a CTM that's around $180 each with each bearing cap having its own needle zerk fitting.
The type of greasable u-joint I would not run unless I did a lot of deep soupy mudding is the type that has a single grease zerk fitting on the body that is used to grease all four bearing caps. That type of u-joint has been cross-drilled with grease channels inside the body so the grease can reach all four bearing caps which weakens the u-joint body.
For a huge percentage of us who offroad (or don't offroad) a traditional sealed u-joint is maintenance free and highly durable. I have run greasable u-joints a few times and to keep up with their grease demands is a PITA that is not warranted, in my opinion, by any socially redeeming values... unless (again) you do deep soupy mud a lot where a greasable u-joint then becomes a good idea. I haven't run greasable u-joints on my driveshafts in years and I'm happy I don't.