Join Date: Jun 2009
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Mine didn't have a hole in it, but I was wondering too about water.
I put in a whole tube of the special XG8 grease that the dealer sells for the splines. It was 8 oz I believe, but I don't know if I was supposed to use it all, I just did. It was real tough to slide the splined shaft back in with all that grease, and I had to work it with a large prybar while pausing to let the excess grease "fart" it's way out. When I got done there was a couple tablespoons worth inside the boot, I just zip tied it back in place with the excess grease in there. It made a big difference in my truck, the acceleration thump after stopping went away completely, it feels like a new truck again.
Hopefully some experts will chime in on how much grease to use.