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How often should I grease and how do I tell when I have put enough grease in them?
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Grease whenever you grease everything else, and grease until it purges from all four bearing caps. If one of the caps will not purge this means you have a problem.
I do not use greasable joints though personally but that debate is endless.
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Install the non-greasable Spicer forged u-joints. They have bronze bushings instead of needle bearings.Whatever you do, don't try adding more grease in the caps, they are ready to go out of the box. They're in my front end, no worries
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I've got a pair of 5-806x spicers for my D60 and they certainly have needle bearings. This is the best joint spicer makes for this application and it certainly doesn't have bronze sleeves.