Weird oil in np205

[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.
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[burnin oil]

Originally Posted by GASoline71

Good info here. I learned something new as well. Never new the 205 was ever mated to an auto tranny from the factory. I had 3 trucks with a 205 and they all were granny low 4 speeds.

Gary

Have the factory adapter for a 4spd to 203 transfer case. Nice setup in the winter. That is a rare! 205s with autos were very common in 3/4 and 1 ton trucks.

[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]

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.
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[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.

[willett]

Originally Posted by GASoline71

Just an observation... the NP205 is a cast iron monstrosity that is bomb proof. There is no chain inside... it's all gear driven. It has a tendency to buck a little in low gear and sounds like a gravel crusher. One of the main reasons cats building mud trucks and pullers use the NP205's is for their strength and durability.

Nowthen... mate that heavy cast iron T-case to a light duty 700R4, and it might be a little much for that tranny. I don't know of any apllications where the NP205 came behind an auto tranny. GM used the NP203 and NP208 behind the slush boxes of the day. The NP205 found itself behind the big granny low 4 speeds. Through my experiences with GM truck T-cases... that's what I have seen and used.

I would hate to see a crack in the tranny where it is mated to the NP205 and letting ATF in the T-case.

Gary

205's came behind th400's on 80's 1 tons
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[Mr. 250r]

Its pretty well known about the whole atf vs gear oil.... the new 89 i just bought has atf which im leaving in it because it calls for that, me personally if i ran an auto i would put atf in it and if i ran a manual like in my 87 i would put whatever i could find faster in it which would be gear oil. I have an 85 book that ill look in and see what it calls for but i think they switched it to atf around 88

just google search np205 atf and you will find endless amounts knowledge lol

[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.