I have a 99 Ram 1500 5.2 Automatic 4x4, firstly I’m trying to make sure I know which T case I have so I can get the right parts. I think it’s an NP231DHD, but I got a rebuild kit with parts that weren’t needed or didn’t fit which was supposed to be for my T case. The second thing is the main issue. Since I bought the truck it’s been leaking fluid onto the driveshaft and it gets flung around underneath. There’s always either a few drops on the driveshaft or When parked on a hill a full puddle under the truck. I had the whole thing re sealed and it keeps leaking, just looking for ideas before I run out of fluid and nuke the T case on a drive.

 

For a transfer case to leak fluid on the driveshaft I can't see how it would do it. I suppose the vacuum switch could leak and end up on the transfer case but not enough to fling it around. Which driveshaft? What color is the fluid?

 

The service manual calls it NV231HD, New Process (NP) ceased to exist after 1990 when it turned into New Venture as joint venture of GM and Chrysler. You might have had a rebuild kit for an older transfer case but I don't think there are major differences. In any case what you describe is a typical TC output seal leak. Check that there is no play in the output shaft bushing, replace the seal (again) and make sure the sealing surface on the yoke does not have any nicks or similar.

 

Clean pinkish red ATF fluid, and it lands on the rear driveshaft, it’s all over the slip yoke

 

There should be a little round tag on the back side of the t-case, that will tell you what it is.

The fluid leaking onto the driveshaft is likely due to a bad seal where the driveshaft plugs in, and a worn bushing that allows the shaft to flop around, and trash the seal.

 

I concur with that