Guys I have a 2004 gmc 2500hd transfer case is an NP1 3 button on dash. I bought the truck a few years back from a dealer. I didnt check the transfer case fluid for about 5k miles or so big mistake. Anyway I changed it and it had about 1qt or less in it. The fluid was grayish silver. And a chunk of metel came out along with other pieces much smaller. I drove another 1k miles did another change fluid came out gray again. I'm thinking metel but the 4x4 works in 4low. Anyone else had this issue.