Trying to figure out what chassis my truck is on. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Outlaw_71 · 05-19-2009, 11:59 PM

Truck is on a 4wd chassis. I believe the t-case is np203 since the shift pattern is-

(front)
low loc
low
nuetral
high
high loc
(seat)

and this is on the knob as well.
It has a 350 sbc. I'm not sure whether the engine is from the truck the cab and bed came from or the truck the chassis and trans/transfer case came from. The reason i know it is not the stock chassis is because the vin on the glovebox says it was an original 2wd truck and the t-case shifter was brought up through a cut through the floor boards. I guess my question is what years chevy fullsizes had NP203's with this shift pattern and how to determine what year the chassis is. My mechanic geustimated about a '75 silverado. What can i check to identify this?

EDIT- If it helps it also has locking hubs and i think my mechanic said it has a 350 trans. It also has heavy leaf packs. I'll count them tomorrow.

Dooley · 05-20-2009, 01:46 AM

GM used the 203 transfer case 1973-79 in light truck line with automatic transmissions. These units did not have manual locking hubs.

OrrieG · 05-21-2009, 12:17 AM

Quote:

Originally Posted by Dooley

GM used ... transmissions. These units did not have manual locking hubs.

Unless a part time kit with hubs was added at some time.

**special-K** · 05-21-2009, 12:53 PM

Quote:

Originally Posted by OrrieG

Unless a part time kit with hubs was added at some time.

Yeah,like about all of them.That full-time was a bad mistake.No secret,either.

Outlaw_71 · 05-22-2009, 10:59 AM

What are yall talking about full time 4wd for? Maybe i don't understand hubs but one of my buddys whos a 4wd tech was telling me that my 4wd wouldn't engage unless I locked my hubs and then put it in 4 wheel. I think the hubs were added but what makes em work? what exactly do they do? Sorry if i'm noobing out on you guys but this is my first truck. I've not had a lifted or 4wd truck before. Alot different than my old monte carlo ss.

EDIT- Maybe yall were saying you think this was a full time 4wd chassis originally and the hubs were added so that the driver could decide when it engages?

Mudder · 05-20-2009, 02:00 AM

Chassis. 67-72, rear shocks mount from the same side of the rear axle. 73- to ??? mounts one in front and the other in the rear of the axle.

Outlaw_71 · 05-20-2009, 11:49 AM

Mudder you've got the answer. It is 73 up. Is there anyway to figure out the exact year. Can you find the vin or some sort of id number on a chassis?

Outlaw_71 · 05-20-2009, 11:59 AM

Here's a pic of my shift knob. Maybe this can help identify it? I just added the boot.

BLACK AND BLUE 67-72 · 05-20-2009, 04:21 PM

Well mine is like that and it is an 81.

Outlaw_71 · 05-20-2009, 09:37 PM

Cool man. Looks like i'm going to have to do a little searching to find a truck with the same chassis and shifter setup as mine. Does anyone know how to identify the engine? I don't know if it is from the chassis truck, cab and bed truck or neither.

Damien · 05-22-2009, 08:24 PM

The '73-87 trucks used different steering components. Here is a link from LMC that will help narrow it down. http://www.lmctruck.com/icatalog/cc/full.aspx?Page=139

05-19-2009, 11:59 PM	#1
Outlaw_71 Registered User Join Date: Mar 2009 Location: Seymour Tennessee Posts: 72	Trying to figure out what chassis my truck is on. Truck is on a 4wd chassis. I believe the t-case is np203 since the shift pattern is- (front) low loc low nuetral high high loc (seat) and this is on the knob as well. It has a 350 sbc. I'm not sure whether the engine is from the truck the cab and bed came from or the truck the chassis and trans/transfer case came from. The reason i know it is not the stock chassis is because the vin on the glovebox says it was an original 2wd truck and the t-case shifter was brought up through a cut through the floor boards. I guess my question is what years chevy fullsizes had NP203's with this shift pattern and how to determine what year the chassis is. My mechanic geustimated about a '75 silverado. What can i check to identify this? EDIT- If it helps it also has locking hubs and i think my mechanic said it has a 350 trans. It also has heavy leaf packs. I'll count them tomorrow. __________________ VIN on glovebox says 1972, previous owner says 1971 C10 4x4 Convert. 7" of lift. New 33" Cepek Mud Country's. Thanks to our Vets past and present Last edited by Outlaw_71; 05-20-2009 at 12:04 AM.

05-20-2009, 01:46 AM	#2
Dooley Registered User Join Date: Mar 2005 Location: North Coast Posts: 1,012	Re: Trying to figure out what chassis my truck is on. GM used the 203 transfer case 1973-79 in light truck line with automatic transmissions. These units did not have manual locking hubs.

05-22-2009, 10:59 AM	#5
Outlaw_71 Registered User Join Date: Mar 2009 Location: Seymour Tennessee Posts: 72	Re: Trying to figure out what chassis my truck is on. What are yall talking about full time 4wd for? Maybe i don't understand hubs but one of my buddys whos a 4wd tech was telling me that my 4wd wouldn't engage unless I locked my hubs and then put it in 4 wheel. I think the hubs were added but what makes em work? what exactly do they do? Sorry if i'm noobing out on you guys but this is my first truck. I've not had a lifted or 4wd truck before. Alot different than my old monte carlo ss. EDIT- Maybe yall were saying you think this was a full time 4wd chassis originally and the hubs were added so that the driver could decide when it engages? __________________ VIN on glovebox says 1972, previous owner says 1971 C10 4x4 Convert. 7" of lift. New 33" Cepek Mud Country's. Thanks to our Vets past and present Last edited by Outlaw_71; 05-22-2009 at 11:00 AM.

05-20-2009, 02:00 AM	#6
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	Re: Trying to figure out what chassis my truck is on. Chassis. 67-72, rear shocks mount from the same side of the rear axle. 73- to ??? mounts one in front and the other in the rear of the axle.

05-20-2009, 11:49 AM	#7
Outlaw_71 Registered User Join Date: Mar 2009 Location: Seymour Tennessee Posts: 72	Re: Trying to figure out what chassis my truck is on. Mudder you've got the answer. It is 73 up. Is there anyway to figure out the exact year. Can you find the vin or some sort of id number on a chassis? __________________ VIN on glovebox says 1972, previous owner says 1971 C10 4x4 Convert. 7" of lift. New 33" Cepek Mud Country's. Thanks to our Vets past and present

05-20-2009, 11:59 AM	#8
Outlaw_71 Registered User Join Date: Mar 2009 Location: Seymour Tennessee Posts: 72	Re: Trying to figure out what chassis my truck is on. Here's a pic of my shift knob. Maybe this can help identify it? I just added the boot. __________________ VIN on glovebox says 1972, previous owner says 1971 C10 4x4 Convert. 7" of lift. New 33" Cepek Mud Country's. Thanks to our Vets past and present

05-20-2009, 04:21 PM	#9
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Re: Trying to figure out what chassis my truck is on. Well mine is like that and it is an 81. __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

05-20-2009, 09:37 PM	#10
Outlaw_71 Registered User Join Date: Mar 2009 Location: Seymour Tennessee Posts: 72	Re: Trying to figure out what chassis my truck is on. Cool man. Looks like i'm going to have to do a little searching to find a truck with the same chassis and shifter setup as mine. Does anyone know how to identify the engine? I don't know if it is from the chassis truck, cab and bed truck or neither. __________________ VIN on glovebox says 1972, previous owner says 1971 C10 4x4 Convert. 7" of lift. New 33" Cepek Mud Country's. Thanks to our Vets past and present Last edited by Outlaw_71; 05-20-2009 at 09:37 PM.

05-22-2009, 08:24 PM	#11
Damien Registered User Join Date: Mar 2007 Location: Farmington, MN Posts: 928	Re: Trying to figure out what chassis my truck is on. The '73-87 trucks used different steering components. Here is a link from LMC that will help narrow it down. http://www.lmctruck.com/icatalog/cc/full.aspx?Page=139 __________________ I can still count my vehicles on two... wait three hands.



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