Crap, I knew it. Thanks for that TSB, in the first pic is what I have in the axle right now. Do you know if the mod will void warranty? I had a feeling something was going to go wrong since the service rep and the tech had no idea what I was talking about when I mentioned the breather possibly causing seal damage. Either way I have to get something on there whether its the mod or the original.
Take a picture of that with enough showing that it is your truck, I don't trust Nissan to try and get out of this one if the seals are compromised already. There would be a barbeque at that dealership and some a$$ would be smelled cooking. Print the TSB and take it with you when you go, and really let them have it, how bout maybe you guys follow some documentation for a change or something. Hopefully the seals are okay, then again, that vent is mighty important, have them fix it first, that way they are responsible for any issues further down the road and its documented. Then you can do the vent mod. You are going to have to take that back there to have them shown that there might be a problem down the road. The axle vent mod is easily removed and should have no effect on warranty, it provides less possible contamination and venting than their crap does, but if it has to go back in for anything, remove the mod and add back on the original, take about two minutes. OH and remember to get the paper when you take it back in explaining why they have to fix it and what they did to repair it correctly, have it documented on that paper that the vent was not installed when the rear was replaced, it was driven unknown by you until now, make sure it is documented that they screwed up. Oh and tear them up on the customer satisfaction survey you will get in the mail and mail it in, do not take it to the dealer, they have a way of disappearing there.