Weird oil in np205

[Redcap]

Originally Posted by GASoline71

Not to derail too much... but I heered through the interwebs that there was an aluminum case NP205 that came out in some MOPAR trucks in the 70's. Anybody hear of one of those animals?

Gary

This is one of those urban myths that everyone has heard about, but no one has ever seen proof.

[tgh117]

Jay,

I don't believe there are any bearings in there, actually its just the seals, and the splined coupling to mate the output of the trans shaft to the input of the transfer case.

I had mine apart a few years ago and replaced the seals for the same problems as the others are reporting, but I don't recall anything other then I put new gaskets on both sides of the adapters, and a pair of new seals.

Good luck, its not really that bad of a job, worst part is man handling the 205 backwards and out of the way to get the adapter off it.

When I was going through all this I noticed that the splined coupling was almost wiped out, and had actually wore out the output shaft of the trans also, but that was from the trucking being a snow plower all its life.

[Orange Crate]

The original TH350 to NP205 set up had an intermediate bearing in the adapter BUT if you try to replace the splined shaft adapter (that the seal lip runs on) you will not be able to get one that has the machined step on it to accept the bearing, it will only come as a straight through splined adapter (chuck the bearing it doesn't do much anyway). When I first tried to order my replacement splined adapter I argued with the sales man and he said that was the only style he had (so I bought it duh), he was right. Lighter faster stronger, we can rebuild it....Here is a shot of the old splined adapter and useless bearing, also hopefully the resolution is high enough that you can zoom in on the page for a cut-away of the original adapter set-up. The box has the new adapter part number on it. Enjoys!

[JayDubBlazer]

So i checked the fluid levels in my tranny and transfer case today. The tranny was fine the TC was uber full. I drained over gallon out of the fill hole. It had to be full to the brim. What i did manage to catch i put in a bottle to see if any metal would settle out. I didnt find any metal but there was a heavier fluid that looked like bacon grease. Could have been rusty water?

Anyway still bearing that whine from the transfer case when i let my foot of the accelerator at 25+ mph.

[vectorit]

That looks like ATF, with 80/90 at the bottom.

Fill the Tcase with 80/90, for a road trip and then check or drain the Tcase lube. Then check the fluid level on your transmission to see if it went down, if it did then you know it found it's way into the Tcase.

[Orange Crate]

I had the same thing happen to my NP205 after having my truck in storage for a couple of years. When I went to get it out of storage I changed all the fluids and antifreeze but who changes their transfer case oil in a situation like that? Well got the truck started and headed out on the 800 mile trip to my new home and the truck started smoking big time after about a hour driving. It took a little while to finally pull the 205 fill plug and out came the same nasty looking stuff. What had happened was the TH350 had finally transferred enough fluid for it to start coming out of the vent at the top of the 205 case and drip onto the exhaust. After connecting the dots all I did was keep my eye on the trans fluid level for the rest of the trip and kept the oil drain pan handy when I checked the NP205 at gas stops. The trip would have been boring if I didn't have those extra chores, right?

[JayDubBlazer]

Does anyone have the exploded view/parts list for the 350/np205 adapter? When I take this apart I want to replace the bearings. I know it's lasted 41 years but not sure if it will last another 41.
Posted via Mobile Device

[truckeez]

lots of people switch to ATF from gear oil,, if you got an old tempermental 4 speed switching out to redline atf smooths everthing out, dosent hurt anything.

[JayDubBlazer]

I replaced the bearing. It was a 207 or 209. Also replaced the seals. Taking the transfer case off by your self using a floor jack and some ratchet straps was like wrestling a grizzly bear. My neighbors in the apartment complex must have thought I was nuts.

The thing is still whining a bit, time to get a louder stereo.
Posted via Mobile Device

[Jaydenn]

Well got the truck began, and advancing out on the 500 mile journey to my new home and the truck began smoking big time, after about a 3 hour driving. It took a little, while to lastly take the 180 fill plug and out came the same unpleasant looking things.

[Mcnasty]

np 205 only get atf when they are the weaker one with the syncros in them. There is a way to tell on the outer case. Has something to do with the round aluminum cover if my memory is right. Do a search on it.