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Just need to know the differential oil types for awd and also the transfer case. Why is this information so hard to come by?

Hi, as stated I have a horrid drive to reverse clunk noise (really any gear to reverse) that seems to be coming from my transfer case. It doesn't do it going into drive from reverse. I have replaced the chain and the old pump with the new design pump, but the problem still persists. I even re-greased my slip yokes with marine grease which seemed to help, but it's still pretty bad. When I get home I'll record a video of the clunk to give you guys a better idea. Anyone ever ran into this problem before? Transfer case operates completely fine and normal other than clunk. Thanks in advance guys!

Hey, just have a quick question. My chain is really loose on my transfer case and I have it apart and ready to have the chain replaced. I wanted to take it apart first to confirm my initial thoughts that the chain was loose. My question is will this http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=120695254448 chain work on my transfer case? Says it's for NP149 so I'm guessing it will, but just wanted to run it by you guys before I go ordering parts I'm not 100% about. Thanks in advance

Hi, lately if i really ever "get on it" with the SS, I hear about 2 pops coming from the middle of underneath the truck. You can also sort of feel it. The motor and transmission are fine. I can't even feel the transmission shift it's in such great shape and it doesn't even sound remotely close to the motor. The truck has 215k miles, but has been VERY well taken care of. I could be wrong, but I'm believing that the noise I'm hearing is coming from the transfer case. I've noticed that if I just drive the truck, the noise never occurs, but it's like it's only when I really get on the throttle is where it occurs. If I drop the truck in first gear, I can get it to happen repeatedly, due to the high torquing at such a low gear. It's still a consecutive 2 pops. If I don't get on it a bit, it never happens. The truck rides as smooth as butter. I'm thinking that maybe the chain is loose and needs to be replaced or I need to buy a rebuild kit with the back half of the casing and bearings, etc. The main driveshaft has a little bit of play and I've noticed a bit of grease around where it enters the transfer case. I was curious if anyone has any idea for the ideal online store to purchase such a rebuild kit. Or maybe someone has experienced the same issue and knows I'm un-accurate at the source of my popping. Thanks in advance guys!