Maybe bit by bit you will end up with even more grease nipples. My truck cam from the factory with 2 grease nipples and now has 17, soon to be 18. The rear drive shaft u-joints was the first to get grease nipples. Have not done the front yet because the front drive shaft never turns unless I make it turn just to keep things free. Am a bit afraid of the u-joints rusting up due to lack of use, so engage the 4wd every now and then to spin the shaft for a few minutes.