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Discussion Starter · #1 ·
Ok, this is probably a question that should receive a "DUH" answer but I gotta ask anyway:

I purchased a used NP203 and replaced my broken one. After installing it, I went to hook up the speedo cable and the connector is now on the opposite side of the tcase rear output housing.

Question(s): Can I just swap the housing from the old NP203 to the newly installed one without having to change any gearing and such? Will I need to pull the tcase again to do this or can it be done from underneath? is this just a matter of removing the rear yoke, unbolting the housing and bolting up the new one?

Keep in mind that my expertise on this Tcase is limited to what I can read in the service manual.....and what you guys tell me.
 

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Going Postal
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Its been a long long time since I've messed with a 203 but...

I think you can swap the tailshaft housing and I think you can do it in the vehicle. I could be wrong. :?



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Discussion Starter · #4 ·
I'm betting you're probably right - the service manual doesn't "show" any issues with removing the rear housing - guess the only way to know for sure is to just do it, huh?

...thanks!!
 

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Going Postal
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If I remember right, you remove the rear housing to install the part time kit. We did that in the vehicle with no troubles.

Let us know how it goes. :thumb:



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Discussion Starter · #6 ·
FYI: once I got the rear flange nut off and the speedo gear assy, the rear housing slides off easily - I can only assume that installation onto the other tcase should be a simple bolt up job. I'll let you know when I get it completed....
 

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Discussion Starter · #7 ·
OK, its completed...the output housings bolt up without any issues. Thanks for all the help!! :mrgreen:
 

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BTW.... be sure and read the fine print in your part time kit... you are supposed to lock it into 4wd every so many miles to splash oil up into the works, or else ya gots problems...
:thumb: :thumb: :thumb:
 

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Discussion Starter · #10 ·
Thanks AJ, I appreciate the input but I didn't put in a part time kit (yet) - I left the Tcase as full time (for now)....
 

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oops, my bad... didn't read it all good enough, I went back and reread it... duh... lol....
Ya hear that sandman????
you are her "BotMaster"
is that one of those "DOM" type of things???? :deal:
:finger: :finger: :finger:
 

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Discussion Starter · #12 ·
LOL...No prob!...I'm just glad you guys here on the board take the time to answer MY silly questions!!...Thanks again fellas!!
 

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I have a part time shaft that I don't need anymore if anyone is interestd in it...... :deal: :deal:
 

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Going Postal
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jrz_dad said:
LOL...No prob!...I'm just glad you guys here on the board take the time to answer MY silly questions!!...Thanks again fellas!!
:thumb:



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sorry for posting this in your thread but I have a question. My friends truck is a '74, 4-speed, 350 truck. I don't know what kind of transfer case he has but the front axle has locking hubs. Did the NP203 equipped trucks have locking hubs even though they are full-time 4-wheel drive? What other t-cases could he have?
Thanks,
Zach
 

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How well do you know these people? If NP203 equipped trucks have locking hubs even though they are full-time 4-wheel drive did, then I will be surprised. I can chat with people on the web for you.
 

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Going Postal
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chevytruckzach said:
sorry for posting this in your thread but I have a question. My friends truck is a '74, 4-speed, 350 truck. I don't know what kind of transfer case he has but the front axle has locking hubs. Did the NP203 equipped trucks have locking hubs even though they are full-time 4-wheel drive? What other t-cases could he have?
Thanks,
Zach
203's behind 4 speeds did not happen that often. In fact I think it was either '74 or '75 was the only year that GM put that combo toghether. He also might have the 205. What kind of shift pattern does the transfer case have? If it has like 4 lo and 4 lo loc positions, its a 203 that has been converted to part time. If it has just Low N 2 Hi and 4 Hi then he should have the 205.



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well the truck is a '74. I haven't looked at the shift pattern on the t-case. The truck is sitting behind his house. Were the 203 and 205 the only t-cases that came stock in '74? I know the t-case is stock so it wasn't converted to part time. Would it have to be a 205 then? Are 205s good t-cases? I was thinking about asking him for some parts off of his truck.
 

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Going Postal
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The 203 and the 205 where about it in the 70's. The 205 is an all gear driven case and is about the best one and is about bullit proof. The 203 was a cast iron chain driven case and is considered a boat anchor by some people. They are OK but not great. If its working fine its most likely not worth the effort to swap it out unless you break it. They are not worth repairing in my opinion. They were discontinued in '80 and then replaced in '81 by the 208 wich is an aluminum chain driven transfer case.



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If NP203 equipped trucks have locking hubs even though they are full-time 4-wheel drive did, then I will be surprised.
Payge actually said something that halfway makes sense. :thumb:
 
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