Just making sure that I am doing this right. I going to the chevrolet dealer to purchase 3 quarts of auto track fluid 2 for my 2004 chevrolet z71 crewcab with the NP8 transfer case. Is there anywhere else that I could buy this fluid at, or even if there is a better oil? Lastly, I need to change the front differential fluid. Should the front diff take 3 quarts or 2? Does it take 75w-90w synthetic or just regular gear oil? Lastly, has anyone heard of a leaking transfer case due to a clip rubbing through the rear of the case and leaking oil? I think it's called a pump rub. I don't have the symptoms nor do I have any pin hole leaks, but I was just wondering how common it is with the 1500 4wheel drive gmt800's.