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Author Topic: Np 205 question  (Read 16654 times)

Offline treestandjunkie

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Np 205 question
« on: March 12, 2010, 06:37:50 pm »
I have a question. I am ignorant when it comes to old school 4x4's. will it hurt anything to drive with the transfer engaged in 4 hi and the hubs on free? My shifter has a ton of slack in it so it is hard to tell if it is engaged. I drove about 40 miles or so and got out to check the truck and found trans fluid blown everywhere and dripping from the transfer case. There was quite a bit on the bottom of the cab just above a tube that comes out of the top of the transfer case. So any help this dummy can get would be greatly appreciated. Where are you Vilezambonie??LOL!!
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Offline Blazin

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Re: Np 205 question
« Reply #1 on: March 13, 2010, 02:38:16 pm »
Shouldn't drive it shifted into 4x4 even if the hubs are out.
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Offline VileZambonie

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Re: Np 205 question
« Reply #2 on: March 14, 2010, 12:03:08 am »
So you have an automatic trans and your transfer case is only working in 4Hi? And when you drive your seeing atf come out of the transfer case? ??? Clarify please what you have and exactly what is happening
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Offline treestandjunkie

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Re: Np 205 question
« Reply #3 on: March 14, 2010, 12:51:03 am »
Hey vilezambonie i sent you a pm.
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Offline treestandjunkie

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Re: Np 205 question
« Reply #4 on: March 14, 2010, 01:03:05 am »
When i took it out of 4wd and tried to put it in park it would grind. I cant tell exactly where the fluid is coming from but the transmission is clean. There is a short tube that comes out of the top of the transfer case so i was wondering if it might have came out of there. Will it hurt to have atf in the transfer? I havnt had the truck very long so i am starting to find all kinds of stuff that needs to be done. Dont know much about older 4x4's so whatever help i can get i would appreciate.
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Offline VileZambonie

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Re: Np 205 question
« Reply #5 on: March 14, 2010, 11:43:26 am »
If you're leaking ATF into the transfercase it will be overfull and your transmission will be low. Check the tranny fluid and pull the check/fill plug on the transfer
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Offline treestandjunkie

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Re: Np 205 question
« Reply #6 on: March 14, 2010, 01:25:22 pm »
Yes Vile my transmission is low and my transfer case is over full. How hard is this to fix??
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Offline VileZambonie

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Re: Np 205 question
« Reply #7 on: March 14, 2010, 02:29:09 pm »
You'll need to replace the input seal on the transfer case. Basically witness mark your driveshafts, remove them, drain the T-case and drop it. Change the input seal and put it back together. Make sure you don't run your trans low.
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Offline Engineer

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Re: np 205 ????
« Reply #8 on: March 14, 2010, 03:41:17 pm »
Driving with the transfer engaged, and hubs disengaged shouldn't have hurt anything.

The way that a NP205 is built all of the gears in the t-case turn all of the time with the input shaft any how. Only thing that is not turning when the NP205 is in 2WD is the front output shaft.

They do this so as to keep a flow of oil to the bearings on the input, and rear output shaft.

Don't know what would cause your oil loss though.
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Offline Engineer

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Re: Np 205 question
« Reply #9 on: March 14, 2010, 03:56:21 pm »
I'll respond here to add to this thread.

OP has this thread running in the engine/drivetrain forum as well.



Driving with the transfer engaged, and hubs disengaged shouldn't have hurt anything.

The way that a NP205 is built all of the gears in the t-case turn all of the time with the input shaft any how. Only thing that is not turning when the NP205 is in 2WD is the front output shaft it'self.

They do this so as to keep a flow of oil to the bearings on the input, and rear output shaft.

Quote from: VileZambonie on March 14, 2010, 02:29:09 pm
You'll need to replace the input seal on the transfer case. Basically witness mark your driveshafts, remove them, drain the T-case and drop it. Change the input seal and put it back together. Make sure you don't run your trans low.

There is not an input shaft seal per-se. The seal that keeps the tranny fluid, and transfer case fluid separate is located in the transfer case mounting adapter.

Some of the later NP205s used ATF, so I doubt that you have harmed it in any way.
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2002 Chevy 2500HD 4x4 8.1/ZF6sp RC/LB
2001 Chevy 2500HD 4x4 6.0/4L85E EC/SB
1997 Chevy Blazer 4x4
1994 Chevy K-2500 4x4 C6P 5.7/4L80E
1979 Chevy K-30 4x4 4sp 4.10
1977 Chevy K-30 4x4 4sp 4.10 454

Dad of an Eagle Scout, and a Life Scout

Offline VileZambonie

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Re: Np 205 question
« Reply #10 on: March 14, 2010, 08:59:08 pm »
There's not an input shaft seal? Then what do you call the input shaft seal? ???
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Offline treestandjunkie

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newbie question
« Reply #11 on: March 16, 2010, 06:02:00 pm »
I searched the forum and failed to find it. I am going to replace the seal that goes between the transmission and the transfer case. How much gear oil will i need for my np205?? And will I need trans fluid as well? Thanks for your help. P.S. Is there any special tools I might need?
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Offline treestandjunkie

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Re: newbie question
« Reply #12 on: March 16, 2010, 06:16:37 pm »
And there are multiple debates about gear oil and atf? Suggestions please ???
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Offline highsierra86

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Re: newbie question
« Reply #13 on: March 16, 2010, 08:09:19 pm »
I'm no expert but I do work at a GM dealer we use ATF so that's what I use
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Offline Irish_Alley

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Re: newbie question
« Reply #14 on: March 16, 2010, 08:35:48 pm »
If you stick to one topic instead of making multiple ones for the same question you will find you will get more help on questions
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