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Since the M135 series of deuces had CV joints the only way to lube that joint was to grease the whole thing, with the balls and stuff. Perhaps the design was not entirely changed when U-joints were introduced, which could be greased like any other U-joint, with a couple of zerks. Just guessing...
If you have gear oil in the boot/steering knuckle, then the axle seal is leaking, which means taking it all apart again and replacing the seal. The axle seal keeps the gear oil in the axle housing, where it lubricates the differential.
The gear oil will wash the grease off the knuckle and rust...