Author Topic: Two wheel drive low range?  (Read 2598 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.
Real trucks are built, not bought Build thread

Give me a long enough lever and a place to stand, and I shall move the earth or break this bolt...Whatever, just hold my beer!

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

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

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.
#1: The easiest and most obvious solution to any problem is 99% of the time correct.
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  74 k10, 77k10    Tom

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 canít tell yourself the truth, who can you tell it to?

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  HIDs, Hella driving lights, Tj Flares, huge bumpers
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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 canít tell yourself the truth, who can you tell it to?

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 canít tell yourself the truth, who can you tell it to?

 


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