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73-87 Chevy _ GMC Trucks => 4 Wheel Drives => Topic started by: geofffry on March 19, 2012, 11:55:58 AM

Title: Two wheel drive low range?
Post by: geofffry on March 19, 2012, 11:55:58 AM
I am trying to figure out what transfer case I have. It has, in order, 4 high lock, 2 high, neutral, 2 low, and 4 low lock. The transfer case is fully functional. there is no numbers, or anything on the transfer case itself. Everywhere else I look, nobody know what I am talking about. I do have the original options sticker that told what the original truck came with. For the most part the truck is original. But there is no option for a different transfer case. The transfer case is married to a 350 transmission that is not factory listed, it lists a 400 transmission. Any help would be appreciated.
Title: Re: Two wheel drive low range?
Post by: thirsty on March 19, 2012, 11:59:07 AM
NP203.
Title: Re: Two wheel drive low range?
Post by: geofffry on March 19, 2012, 05:00:34 PM
Every np203 I find doesn't have that option. Was that only a certain kind of np203.

1976 Chevy K20 cheyenne camper special.
Title: Re: Two wheel drive low range?
Post by: beastie_3 on March 19, 2012, 08:16:37 PM
I second the opinion of a NP203. If you are still unsure, take a pic of the backside (camera facing front of truck)
Title: Re: Two wheel drive low range?
Post by: DustyRusty on March 19, 2012, 08:20:43 PM
Hi geoffrey, welcome to the site.

I agree w/ thirsty.  Are you sure you are not confusing the NP203 wth the NP205?  Both look identical from a short distance.  Both have an ID tag on the back if it hasn't been removed.  The NP205 does not have the 'lock' feature.  It has a different drain plug on the back cover but the NP203 doesn't have a drain plug; it's drained by loosening the cover bolts.  Both have fill plugs in the same loc'n, IIRC.  I think there are threads w/ photos on this site that show the outside differences of the cases.  Maybe this will help.

Rusty
Title: Re: Two wheel drive low range?
Post by: Jason S on March 19, 2012, 10:32:00 PM
It sounds like you have a NP203 with a part time conversion. 

The NP203 could be had behind the TH350, TH400 and SM465 transmission.

After a part time kit is installed in the NP203, you'll come out with a 2wd low position as well as the 2wd high position.
Title: Re: Two wheel drive low range?
Post by: bake74 on March 22, 2012, 07:45:11 AM
     My 74 k10 with a Sm 465 transmission, has a NP203, and on the face plate for the transfer case (inside the truck on floor ) it has the same configuration as you described.  Does your shifter handle have a Hurst shifter on it ?  These came factory on the NP203 on certain years.
Title: Re: Two wheel drive low range?
Post by: Irish_Alley on March 22, 2012, 09:10:15 AM
how does the 203 have 4 selections? wouldnt that make it a 205
Title: Re: Two wheel drive low range?
Post by: ehjorten on March 22, 2012, 02:01:24 PM
how does the 203 have 4 selections? wouldnt that make it a 205

No...that would make it a 207 (203+4)!  ;D
Title: Re: Two wheel drive low range?
Post by: Da67goatman on March 22, 2012, 02:01:51 PM
Twin stick? or single stick?  sounds more like a 205 than a 203.  Is the case aluminum or cast iron?
Title: Re: Two wheel drive low range?
Post by: Donut on March 23, 2012, 04:57:27 PM
Fine, I'll bite.
Post a pic and eliminate the guess work.  After 35 years, it could be anything.
Title: Re: Two wheel drive low range?
Post by: bake74 on March 23, 2012, 05:01:13 PM
     I know my 203 has the pto ports on both sides of the transmission, can anybody tell me if the 205 has them too, it has been a while since I looked at a 205 and can not remember.
Title: Re: Two wheel drive low range?
Post by: Irish_Alley on March 24, 2012, 08:49:59 AM
Like said if it has a drain plug its a 205
Title: Re: Two wheel drive low range?
Post by: Jason S on March 31, 2012, 09:52:00 AM
Does the back of your transfer case look like this one?

(https://lh5.googleusercontent.com/-cScXaDn5m9M/TrGmHttpEcI/AAAAAAAAAB0/N2JQViESY7k/s400/DSC00579.JPG)

If so, then it's a NP203. 
Title: Re: Two wheel drive low range?
Post by: Irish_Alley on April 01, 2012, 03:38:06 AM
note: in the middle of this pic is the fill plug not drain plug