Per the recommendation of others here this is the one I picked up at Autozone, the flexible hose needed to be purchased separately:



I use both hands to push it on the zerk, once it's on I can hold it in place with one hand and then I find the pistol grip. The pistol grip and the flexible hose, I think are both essential in DIY. I also find that I need to move the truck to put the zerk fittings in the most accessible positions, again per the recommendation of someone else here.

For the U joint, you can actually hear when it finally starts to express, although you can visually confrim it, 6-7 pumps is all it took. I'm putting in around 16-17 pumps on the Slide Yoke fittings. I've read that you don't want to put too much, but then the guys that are successful at eliminating the clunck via greasing the driveshaft, have reported being aggressive.