4X4 and transfer case questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**old Rusty C10** · 01-25-2016, 08:11 PM

I have a 79 K10 plow truck that constantly breaks down when it snows. I have the opportunity to get a 87 K10for dirt cheap as it has a blown motor. My question is the transfer cases are interchangeable even if the newer truck has a th400 or th400 trans? I have a motor to put in the "new" truck but im not sure which is going to be more advantageous

andrewmp6 · 01-25-2016, 09:54 PM

The 79 should be a np203 or np205 maybe.The 87 should be a 700r4 with a np208 on it.They won't swap with each other with out a adapter kit and input shaft swap in the trans.If both had the same trans and t case you could swap them.

**old Rusty C10** · 01-27-2016, 04:51 PM

How does one tell the difference between them all the transfer case came out of a well used 1977 or 1979 truck its currently in a 79 truck K10 I know a 203 is chain driven and a 205 is gear driven but can you tell from the outside of the case? I think I have the NP203 does an NP205 direct swap in?

enaberif · 01-27-2016, 07:23 PM

205 has a small circle center case towards the back with 3 bolts.

CrewCab59 · 01-27-2016, 07:39 PM

Top left Np208 , Top right Np203
Bottom center Np205

andrewmp6 · 01-28-2016, 02:53 AM

They all should have a tag on it,The np205 and np203 both have a iron case and do look a like.The np208 has a aluminum case to it.

cadillac_al · 01-28-2016, 09:45 AM

If you still have marking by the shifter the 203 doesn't have a 2 hi.

01-25-2016, 08:11 PM	#1
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,277	4X4 and transfer case questions I have a 79 K10 plow truck that constantly breaks down when it snows. I have the opportunity to get a 87 K10for dirt cheap as it has a blown motor. My question is the transfer cases are interchangeable even if the newer truck has a th400 or th400 trans? I have a motor to put in the "new" truck but im not sure which is going to be more advantageous __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

01-25-2016, 09:54 PM	#2
andrewmp6 Registered User Join Date: Jan 2009 Location: Louisville,Ky Posts: 5,811	Re: 4X4 and transfer case questions The 79 should be a np203 or np205 maybe.The 87 should be a 700r4 with a np208 on it.They won't swap with each other with out a adapter kit and input shaft swap in the trans.If both had the same trans and t case you could swap them.

01-27-2016, 04:51 PM	#3
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,277	Re: 4X4 and transfer case questions How does one tell the difference between them all the transfer case came out of a well used 1977 or 1979 truck its currently in a 79 truck K10 I know a 203 is chain driven and a 205 is gear driven but can you tell from the outside of the case? I think I have the NP203 does an NP205 direct swap in? __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! Last edited by old Rusty C10; 01-27-2016 at 06:36 PM.

01-27-2016, 07:23 PM	#4
enaberif Registered User Join Date: Jan 2009 Location: Calgary, AB Posts: 1,181	Re: 4X4 and transfer case questions 205 has a small circle center case towards the back with 3 bolts.

01-27-2016, 07:39 PM	#5
CrewCab59 Registered User Join Date: Jul 2010 Location: Knoxville,TN Posts: 1,185	Re: 4X4 and transfer case questions Top left Np208 , Top right Np203 Bottom center Np205 Attached Images __________________ 1972 Custom Deluxe 20 4x4 burb 1971 GMC SWB CST 4x4 1972 GMC k20 4x4 (X- brush truck ) 1971 Chevy CST Blazer 4x4 1971 Chevy C/10 1970 Cab Chassis C30 157" 1971 Cab Chassis Custom 30 Deluxe 157" 292/4spd ( Napco Replica ) 1988 Chevy V30 4x4 wrecker challenger 4812

01-28-2016, 02:53 AM	#6
andrewmp6 Registered User Join Date: Jan 2009 Location: Louisville,Ky Posts: 5,811	Re: 4X4 and transfer case questions They all should have a tag on it,The np205 and np203 both have a iron case and do look a like.The np208 has a aluminum case to it.

01-28-2016, 09:45 AM	#7
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,354	Re: 4X4 and transfer case questions If you still have marking by the shifter the 203 doesn't have a 2 hi. __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10



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