74 GMC 4WD diagram question/concern... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

LS1_C10 · 09-04-2010, 09:45 PM

I dont know the gear diagram for 4WD. My wife dropped a toolbox on the floorshift today and I was wondering if yall could teach me the gear position locations. I havent had it very long, so my knowledge is limited. I believe its factory 4WD with a 205 transfer case, but I could be wrong.
My terminology sucks too, this is my first vehicle that didnt have push button 4WD. And it has a full boot too so I cant just see the slots. Unless...they are underneith? ANY info is greatly appreciated.

Prong · 09-05-2010, 02:03 AM

I assume you've got the factory 4 speed tranny to have the 205 T/C. If so, it's like this:

----Dashboard----
4 Low
Neutral
2 High
4 High
---Seat---

If you've got an auto tranny, then you have a 203 TC. They're like this:

---Dashboard--
4 Low Lock (true 4wd)
4 Low
Neutral
4 High (here's where you want it for normal driving)
4 High Lock (true 4wd)
--Seat--

If you're still unsure of what you have, post a pic so it can be positively identified.

LS1_C10 · 09-05-2010, 02:25 AM

Quote:

Originally Posted by Prong

I assume you've got the factory 4 speed tranny to have the 205 T/C. If so, it's like this:

----Dashboard----
4 Low
Neutral
2 High
4 High
---Seat---

If you've got an auto tranny, then you have a 203 TC. They're like this:

---Dashboard--
4 Low Lock (true 4wd)
4 Low
Neutral
4 High (here's where you want it for normal driving)
4 High Lock (true 4wd)
--Seat--

If you're still unsure of what you have, post a pic so it can be positively identified.

I feel like an idiot not offering pics first. Im photobucketing right now.
I have an automatic. I was told it was the 205. But I dont know what Im looking at.
Here ya go.

BigRed76 · 09-05-2010, 04:03 PM

T-case has no drain plug, that looks like 203 to me

Davidmichael · 09-05-2010, 05:44 PM

don't the 205's have a center gear? If I am not mistaken, that should be a chain driven case. likely the 203. But it's been awhile since I messed with my 205.

76/85 Truck · 09-05-2010, 06:46 PM

I believe that is a NP203. It should be as prong said with the LOCK positions. So:

---Dashboard--
4 Low Lock (true 4wd)
4 Low
Neutral
4 High (here's where you want it for normal driving)
4 High Lock (true 4wd)
--Seat--

BigRed76 · 09-05-2010, 07:49 PM

Quote:

Originally Posted by Davidmichael

don't the 205's have a center gear? If I am not mistaken, that should be a chain driven case. likely the 203. But it's been awhile since I messed with my 205.

Good catch, the 205's do have a center gear

proving this one the be a 203

USSkoval · 09-05-2010, 08:44 PM

Yep, that big monstrosity is a 203. If it has been converted to part-time, "Loc" positions would be 4x4, the others would be 2wd.

LS1_C10 · 09-05-2010, 11:48 PM

Quote:

Originally Posted by USSkoval

Yep, that big monstrosity is a 203. If it has been converted to part-time, "Loc" positions would be 4x4, the others would be 2wd.

Im not sure I get this. Are you asking if it has lockers? Cus it does.

USSkoval · 09-05-2010, 11:53 PM

Quote:

Originally Posted by LS1_C10

Im not sure I get this. Are you asking if it has lockers? Cus it does.

No, but there is the possibility that the transfer case was converted to part time. If so, "Loc" will be the only 4x4 positions.

LS1_C10 · 09-05-2010, 11:54 PM

Quote:

Originally Posted by USSkoval

No, but there is the possibility that the transfer case was converted to part time. If so, "Loc" will be the only 4x4 positions.

OOk.
What gear does the truck need to be in to shift? Does it matter?

USSkoval · 09-06-2010, 12:00 AM

Quote:

Originally Posted by LS1_C10

OOk.
What gear does the truck need to be in to shift? Does it matter?

I've almost always had to be stopped and in neutral... but all my 203's have had shifters that don't like to move.

LS1_C10 · 09-06-2010, 12:00 AM

Quote:

Originally Posted by USSkoval

I've almost always had to be stopped and in neutral... but all my 203's have had shifters that don't like to move.

Yeah...I definitely have one of those. Lol.

09-04-2010, 09:45 PM	#1
LS1_C10 Dont want a large Farva Join Date: May 2009 Location: Mustang Oklahoma Posts: 165	74 GMC 4WD diagram question/concern... I dont know the gear diagram for 4WD. My wife dropped a toolbox on the floorshift today and I was wondering if yall could teach me the gear position locations. I havent had it very long, so my knowledge is limited. I believe its factory 4WD with a 205 transfer case, but I could be wrong. My terminology sucks too, this is my first vehicle that didnt have push button 4WD. And it has a full boot too so I cant just see the slots. Unless...they are underneith? ANY info is greatly appreciated.

09-05-2010, 02:03 AM	#2
Prong Registered User Join Date: May 2007 Location: CO Posts: 475	Re: 74 GMC 4WD diagram question/concern... I assume you've got the factory 4 speed tranny to have the 205 T/C. If so, it's like this: ----Dashboard---- 4 Low Neutral 2 High 4 High ---Seat--- If you've got an auto tranny, then you have a 203 TC. They're like this: ---Dashboard-- 4 Low Lock (true 4wd) 4 Low Neutral 4 High (here's where you want it for normal driving) 4 High Lock (true 4wd) --Seat-- If you're still unsure of what you have, post a pic so it can be positively identified.

09-05-2010, 04:03 PM	#4
BigRed76 Registered User Join Date: Jan 2010 Location: Loveland, CO Posts: 1,921	Re: 74 GMC 4WD diagram question/concern... T-case has no drain plug, that looks like 203 to me __________________ Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB

09-05-2010, 05:44 PM	#5
Davidmichael Registered User Join Date: Jun 2010 Location: Pittsburgh PA Posts: 686	Re: 74 GMC 4WD diagram question/concern... don't the 205's have a center gear? If I am not mistaken, that should be a chain driven case. likely the 203. But it's been awhile since I messed with my 205. __________________ 86 Suburban 2WD = rolled it and totaled it 83 LWB STD Cab 4x4 = went to the scrapper. Was my baby. 84 Suburban 2WD = stripped it/ scrapped it 81 8 foot bed made into a trailer 86 Suburban going to be made into a trailer 91 Suburban 4x4 = that's my baby 00 S10 Xtreme STD Cab 01 S10 ZR2

09-05-2010, 06:46 PM	#6
76/85 Truck Registered User Join Date: Jun 2010 Location: Libby, MT Posts: 163	Re: 74 GMC 4WD diagram question/concern... I believe that is a NP203. It should be as prong said with the LOCK positions. So: ---Dashboard-- 4 Low Lock (true 4wd) 4 Low Neutral 4 High (here's where you want it for normal driving) 4 High Lock (true 4wd) --Seat-- __________________ Rich My first truck!! 1976 Chevy 3/4 ton Camper Special and a 1985 GMC body. Has a 350, 4 BBL Edelbrock, with a Turbo 350, and NP205 T-case.

09-05-2010, 08:44 PM	#8
USSkoval Registered User Join Date: Jul 2009 Location: West Jefferson, OH Posts: 999	Re: 74 GMC 4WD diagram question/concern... Yep, that big monstrosity is a 203. If it has been converted to part-time, "Loc" positions would be 4x4, the others would be 2wd. __________________ -Andy '77 K5 Blazer '78 K10 Shortbed '78 C20 Suburban '79 K30 Crew Cab Dually '84 C10 Short Stepside '88 K20 Suburban



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