Author Topic: Two wheel drive low range?  (Read 12124 times)

Offline geofffry

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Two wheel drive low range?
« 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.

Offline thirsty

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Re: Two wheel drive low range?
« Reply #1 on: March 19, 2012, 11:59:07 AM »
NP203.
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Offline geofffry

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Re: Two wheel drive low range?
« Reply #2 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.

Offline beastie_3

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Re: Two wheel drive low range?
« Reply #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)

Offline DustyRusty

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Re: Two wheel drive low range?
« Reply #4 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
1975 K-10 SWB Fleetside - 350/SM465/NP205/D44F 12-boltR, 3.73 gears.  Original owner.
Customized by rust.

Offline Jason S

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Re: Two wheel drive low range?
« Reply #5 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.
1973 GMC K2500, Super Custom, Camper Special, 350, TH350, NP203, 4.10's
1974 Chevrolet K10, Custom Deluxe, 350, SM465, NP203, 3.73's

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Offline bake74

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Re: Two wheel drive low range?
« Reply #6 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.
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Offline Irish_Alley

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Re: Two wheel drive low range?
« Reply #7 on: March 22, 2012, 09:10:15 AM »
how does the 203 have 4 selections? wouldnt that make it a 205
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline ehjorten

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Re: Two wheel drive low range?
« Reply #8 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
-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline Da67goatman

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Re: Two wheel drive low range?
« Reply #9 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?
<Pitcrew>
1989 R2500 Suburban mild 350 TBI 700r4 10.5" 14bolt 4.10 w/ 33s
1992 fullsize Blazer 4x4  35s no lift, 4.10s, Hella driving lights, TJ Flares, Huge bumpers, Snorkel, custom interior

Offline Donut

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Re: Two wheel drive low range?
« Reply #10 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.
'73 Chevy K-20 ***SOLD***
350/tbh350/np205
My plow was half price if i took the truck with it.

'86 C-30 dually, 454/tbh400

Offline bake74

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Re: Two wheel drive low range?
« Reply #11 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.
#1: The easiest and most obvious solution to any problem is 99% of the time correct.
#2: There is no such thing as impossible, it just takes longer.
  74 k10, 77k10    Tom

Offline Irish_Alley

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Re: Two wheel drive low range?
« Reply #12 on: March 24, 2012, 08:49:59 AM »
Like said if it has a drain plug its a 205
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline Jason S

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Re: Two wheel drive low range?
« Reply #13 on: March 31, 2012, 09:52:00 AM »
Does the back of your transfer case look like this one?



If so, then it's a NP203. 
1973 GMC K2500, Super Custom, Camper Special, 350, TH350, NP203, 4.10's
1974 Chevrolet K10, Custom Deluxe, 350, SM465, NP203, 3.73's

"1) Peace through strength; 2) Trust but verify; 3) Beware of evil in the modern world"

Offline Irish_Alley

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Re: Two wheel drive low range?
« Reply #14 on: April 01, 2012, 03:38:06 AM »
note: in the middle of this pic is the fill plug not drain plug
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes