Slick tool! I got a 1" x 12" cold chisel to use on my pass. side whenever I can get to it. I'm hoping the metal of the inner axle housing is harder than the chisel. Don't want to chip/cut anything with the chisel.
Make sure you hold inward pressure on your tool during install. I was using a stanley wonder bar, not very dense (I guess), I had to ensure it wasn't bouncing off the axle between hammer strikes. I had to give it 4-5 good, hard, rapid hits to get that clip to pop in. This is vs. slow hard hits with a "wind-up." And, I was directly under it lying perpendicular to the truck (or in-line with the axles) and hitting on the notch facing directly down. That gave me the most room to really get the tool seated well and room to strike. I'm sure this is where a helper using a tool to push inward from another position can help a lot.
Went to Lowes and also found a 2" PVC cap fits perfectly around the hole in the axle seal and sits nicely on the flange for use as a seal driver. It fits both seals, The only difference is the width of the outer flanges
I've read a few other places that on the 4th gen, the clip on the end of the shaft has to be facing down. The confusion comes from a write up on 4x4wire mentioning it facing up, but that was for a 3rd gen IIRC...
Anybody have a good DIY seal driver to fit the knuckle seals? I didn't replace my drivers side, it didn't get damaged when I removed the axle, but I have 'em in case it happens. Still trying to come up with a suitable method to install one if I need to on my other axle.