NP203 Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Gene · 07-25-2009, 06:16 PM

Ok, so I hate to be "that guy" who asks all the obvious questions about 4 wheel drives, but i'm to the point in my build where I want to make sure that I have all the correct parts for my truck. I'm pretty sure that the NP203 did not come in a 67-72 truck? Am I right? And I know that originally they were a full time 4wd transfer case right? Ok, so here's my problem. I'm researching trying to figure out what transfer case I have and after looking at many pictures of various cases I decide that I have a NP203(22 inches from front of case to rear). But I read that there is a part time upgrade that is available for these to make them work like a NP205. So i'm working the levers on the side of the case and one lever has three positions, one locks the front and rear together, one is neutral, and one seems to just power the rear? The other lever has 2 positions which i'm assuming is High/Low? So does it seem to you all that I have a transfer case that has been modified to part time 4wd? Thanks!

Fubar · 07-26-2009, 11:32 AM

Does your front axle have hubs to lock or unlock? If so then it most likley has a part time conversion kit in it. If you put the hubs in the free position and the t-case in hi range (not hi-loc) and the truck still moves then it has been converted.

Fubar · 07-26-2009, 11:37 AM

Here is a good article on how to convert a 203 with a few pics that could help you tell if you have a np203 or not. http://www.4wheeloffroad.com/howto/47538/index.html

Gene · 07-26-2009, 05:58 PM

Yeah, it has lockout hubs, but this transfer case didnt come with this truck frame. I did some trading for it back when I first started the process. All I know is that I thought the NP203 was full time, and mine has a selection where the front output does not turn but the back does?

onlyifihadachevy · 07-26-2009, 07:10 PM

look on the tag on it above the front output it has the model numbers and gear ratio on it.

70 beast · 07-27-2009, 12:32 AM

i had a 203 with a part time kit in my 70.
on my levers it had high lock, high, neutral, low, and low lock, and the other was for 2wd and 4wd.

me being the college edu-macated idiot that i am, gave the 203 to a buddy that was going to use the case in a doubler when i swapped trans. but i did get the shifter assembly off it

**71blksuper4x4** · 07-27-2009, 09:13 AM

Gene, I would sell it and get you a 205. They are fairly easy to come by still, and I bet you could pick one up for a couple bones. Trevor

Gene · 07-27-2009, 04:34 PM

Wanna buy a NP203 Trevor?

Here's my case, I didnt see a model number or a tag above the front output shaft? Just a number stamped on the flat part above it (K8M08)??

willett · 07-28-2009, 12:04 AM

my 203 is fulltime, but i have locking hubs.

perhaps you could give that a go?

07-25-2009, 06:16 PM	#1
Gene Registered User Join Date: Aug 2002 Location: Muskogee, Oklahoma Posts: 2,914	NP203 Question Ok, so I hate to be "that guy" who asks all the obvious questions about 4 wheel drives, but i'm to the point in my build where I want to make sure that I have all the correct parts for my truck. I'm pretty sure that the NP203 did not come in a 67-72 truck? Am I right? And I know that originally they were a full time 4wd transfer case right? Ok, so here's my problem. I'm researching trying to figure out what transfer case I have and after looking at many pictures of various cases I decide that I have a NP203(22 inches from front of case to rear). But I read that there is a part time upgrade that is available for these to make them work like a NP205. So i'm working the levers on the side of the case and one lever has three positions, one locks the front and rear together, one is neutral, and one seems to just power the rear? The other lever has 2 positions which i'm assuming is High/Low? So does it seem to you all that I have a transfer case that has been modified to part time 4wd? Thanks!

07-26-2009, 11:32 AM	#2
Fubar Registered User Join Date: Dec 2003 Location: Santa Rosa ,CA Posts: 96	Re: NP203 Question Does your front axle have hubs to lock or unlock? If so then it most likley has a part time conversion kit in it. If you put the hubs in the free position and the t-case in hi range (not hi-loc) and the truck still moves then it has been converted.

07-26-2009, 11:37 AM	#3
Fubar Registered User Join Date: Dec 2003 Location: Santa Rosa ,CA Posts: 96	Re: NP203 Question Here is a good article on how to convert a 203 with a few pics that could help you tell if you have a np203 or not. http://www.4wheeloffroad.com/howto/47538/index.html

07-26-2009, 05:58 PM	#4
Gene Registered User Join Date: Aug 2002 Location: Muskogee, Oklahoma Posts: 2,914	Re: NP203 Question Yeah, it has lockout hubs, but this transfer case didnt come with this truck frame. I did some trading for it back when I first started the process. All I know is that I thought the NP203 was full time, and mine has a selection where the front output does not turn but the back does?

07-26-2009, 07:10 PM	#5
onlyifihadachevy Registered User Join Date: Mar 2009 Location: seaside,ca Posts: 778	Re: NP203 Question look on the tag on it above the front output it has the model numbers and gear ratio on it. __________________ 72 gmc 2500 2wd drive convert My 72 thread http://67-72chevytrucks.com/vboard/s...d.php?t=346712 THe other truck, wheeler 69 1/2 4x4, yellow and rusty. http://67-72chevytrucks.com/vboard/s...d.php?t=350300

07-27-2009, 12:32 AM	#6
70 beast Certified Hobbiest Join Date: Jul 2007 Location: Sacramento, Ca Posts: 384	Re: NP203 Question i had a 203 with a part time kit in my 70. on my levers it had high lock, high, neutral, low, and low lock, and the other was for 2wd and 4wd. me being the college edu-macated idiot that i am, gave the 203 to a buddy that was going to use the case in a doubler when i swapped trans. but i did get the shifter assembly off it

07-27-2009, 09:13 AM	#7
71blksuper4x4 SWB 4x4 Collector Join Date: Jun 2001 Location: Osage City, KS Posts: 5,156	Re: NP203 Question Gene, I would sell it and get you a 205. They are fairly easy to come by still, and I bet you could pick one up for a couple bones. Trevor __________________ TREVOR 1970 CST swb 4x4 (speedwarning,cruise,tilt,tach,8track, original red shoulder belts,tow hooks) 1972 Jimmy (soon to be Hickey cloned) 1971 Cheyenne Super 4x4 swb (tilt,tach,buckets, original blue shoulder belts,am/fm,cruise,tow hooks, dealer 8 track) 1972 Cheyenne Super K20 4x4 Custom Camper (tilt, tach, am/fm, tow hooks, bed toolbox, aux gas tank 1972 Cheyenne Super Crew Cab K30 4x4 Duramax, Allison, np205, buckets, tow hooks (CURRENT PROJECT) http://67-72chevytrucks.com/vboard/s...d.php?t=624819 1989 V3500 Crew Cab (454tbi, NV4500, np205) 1970 Chevelle SS (LS5 454,th400,8track,buckets,tach) :2004 Jeep Wrangler Rubicon (daily driver) WTB: 1968-70 Cruise Control Lever

07-27-2009, 04:34 PM	#8
Gene Registered User Join Date: Aug 2002 Location: Muskogee, Oklahoma Posts: 2,914	Re: NP203 Question Wanna buy a NP203 Trevor? Here's my case, I didnt see a model number or a tag above the front output shaft? Just a number stamped on the flat part above it (K8M08)?? Attached Images Last edited by Gene; 07-27-2009 at 04:52 PM. Reason: add pics

07-28-2009, 12:04 AM	#9
willett Another Day, Another Dollar Join Date: Nov 2008 Location: North Vancouver, BC Posts: 1,316	Re: NP203 Question my 203 is fulltime, but i have locking hubs. perhaps you could give that a go? __________________ -78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square"



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