NP 205 info needed

[thealien]

I have a 1972 GMC Jimmy with an NP 205 transfer case and 350 auto transmission. The transmission leaks into the transfer case. I would like to rebuild the transfer case and replace the tailshaft seal.

Can this be done with regular hand tools (I do have a 20 ton press)

Is there any specific info I need for parts?

Where can I get a rebuild kit?

Is there an additional seal I can install on the TC to prevent fluid entering (thought I read that somewhere)?

What color should I paint the transfer case?

Thanks
Mark

 

[slyguy_22]

Do a search on np205 rebuild kits on google ull find tons of info plus complete breakdowns on them. as i remember all u need is basic hand tools and a press. u might need a puller but dont remember.

 

[bp71k5]

You actually need to replace the tranny rear seal. I don't remember if the 205 has a seal on it?

I rebuilt my 205 with basic hand tools, but you'll want a good large pair of snap ring pliers.

If it's just leaking a little, you probably don't even need to totally rebuild it. Just replace the gaskets out the output housings and covers if they are leaking.

 

[thealien]

I thought I read somewhere you could add a seal on the input side?

The rebuild kits seem about $200 so to have it all rebuilt for another 30+ years it would be worth it to me. (I may just get the parts and do it next winter).

 

[bp71k5]

I think the seal is on the tranny adaptor and not actually on the transfer case. So you just have to remove the transfer case.

 

[thealien]

You actually need to replace the tranny rear seal. I don't remember if the 205 has a seal on it?

I rebuilt my 205 with basic hand tools, but you'll want a good large pair of snap ring pliers.

If it's just leaking a little, you probably don't even need to totally rebuild it. Just replace the gaskets out the output housings and covers if they are leaking.

Actually it is only leaking a small amount. The transmission is leaking into the transfer case so since I have to take the transfer case out to do the transmission tail shaft seal I may as well freshen up the transfer case?

 

[wazzabie]

I think the seal is on the tranny adaptor and not actually on the transfer case. So you just have to remove the transfer case.

yes the seal is on the tranny to tcase adapter. It is an oring seal that goes around the sleave.
As a cheap fix is it possible to... run the tcase with the same tranny fluid as in the tranny. Not the OEM fluid for the NP205. The np205 I picked up had been run with tranny fluid with no problems. Besides fixing a NP205 is much easier then fixing a tranny. just my 2 cents.

 

[bp71k5]

Yea, that might work for a while, but when mine did it, the transfer case started overflowing out of the speedo cable gear and a few other spots. So I was pouring it in the tranny and it was just leaking onto the ground a little farther back instead.

 

[thealien]

Yea, that might work for a while, but when mine did it, the transfer case started overflowing out of the speedo cable gear and a few other spots. So I was pouring it in the tranny and it was just leaking onto the ground a little farther back instead.

What I am trying to eliminate!