do you use in a np 205 i red that in a 203 you are supost to use a 10w30 oil not gear oil is that the same for the 205

I have heard that you are supposed to run 30w to 50w in the 203's, they have some kind of a pump in them to oil them while turning. I ran 80-90w in mine for years and never had any trouble with it though...
the 205's take 80-90w the gears spinning, slings the oil around.

I have factory literature for my '71 IHC TravelAll w/NP205 and my '71 K10 & K20 burbs w/NP205s. Both list GL-5 for the xfer cases. Unless you expect occasional contamination, use 100% synthetic. NP205s hold up a long time with regular dino oil changes. Synthetic can only be better.

BTW, this has been asked many a time on this forum.





(psst....search):D

A 203 has no "pump" and I would assume that a chain would sling oil as well as a gear......

A 203 has no "pump" and I would assume that a chain would sling oil as well as a gear......

In a 203 the item that needs oil the most is the rear tail-cone. It has an oil catch which the chain throws oil into. This oil is pushed by a plastic oil pump gear into the rear output shaft bearing. This oil catch needs to be refilled occasionaly, and the only way to do this is to drive in 4wd (or lock the hubs).

Do your homework before you say something...

Check this out
http://www.offroad-tech.com/tech/transfercase/http://www.offroad-tech.com/tech/transfercase/

Crap this one

Transfercase info (http://www.offroad-tech.com/tech/transfercase/)

just put what you have in it. atf, 10-30, 80-90, 90-145, whatever there is anrticle of how "this is the right one" for all of them. i use 80-90 with out a second thought and have no probs