If an A-D is not dripping under the u-joint enclosure, you are out of lubricant.
Where did you find the 0.5 qt recommendation.? That is how much you should add if you open and then close the u-joint housing.
The-u-joint housing gets it lubricant from the gear oil moving back into the u-joint housing from the transmission.
That drip is hard to eliminate. Two of my trucks now have no drips under the u-joint housing. I expect that will not last long.
Place a disposable diaper on the floor under the u-joint housing.
