12 Bolt Differential ID Identification Help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ADimas · 08-21-2018, 03:59 PM

I am trying to figure out where the differential on my 1969 C10 Step Side has. I have gone through the search on the board and the other postings I found do not match anything on my differential.

That being said here is what I have stamped on it.

Passenger Side
THC W138 2
NF3896838

Driver Side
GM 61
CN3

I tried attaching the pictures but for some reason it says missing token.
Here is a link with the pictures any help is appreciated.
https://www.dropbox.com/sh/g6ds1jezx...ZlisreP2a?dl=0

AtomicYJ · 08-21-2018, 08:09 PM

Looks like a standard 12 bolt truck differential. Used from '63 or so until '81.

PepperTreeGarage · 08-22-2018, 12:27 AM

Hope this helps~~~~~

**uncle** · 08-22-2018, 08:12 AM

THC code shows 71 model rear 3:73 non posi.

**LockDoc** · 08-22-2018, 09:43 AM

Quote:

Originally Posted by ADimas

I am trying to figure out where the differential on my 1969 C10 Step Side has. I have gone through the search on the board and the other postings I found do not match anything on my differential.

That being said here is what I have stamped on it.

Passenger Side
THC W138 2
NF3896838

Driver Side
GM 61
CN3

I tried attaching the pictures but for some reason it says missing token.
Here is a link with the pictures any help is appreciated.
https://www.dropbox.com/sh/g6ds1jezx...ZlisreP2a?dl=0

This thread I posted should have came up in your search. All you need is the THC.

http://67-72chevytrucks.com/vboard/s...d.php?t=578793

If you are posting pictures and the "missing Security Token" message comes up, it's telling you that your pictures are too big. Size the pictures down to a width of 1150 Pixels and you should be good to go....

LockDoc

ADimas · 08-24-2018, 07:19 AM

Quote:

Originally Posted by LockDoc

This thread I posted should have came up in your search. All you need is the THC.

http://67-72chevytrucks.com/vboard/s...d.php?t=578793

If you are posting pictures and the "missing Security Token" message comes up, it's telling you that your pictures are too big. Size the pictures down to a width of 1150 Pixels and you should be good to go....

LockDoc

Thank you everyone for the help ya'll are awesome. Next time I try to upload pictures I will size the pictures down.

08-21-2018, 03:59 PM	#1
ADimas Registered User Join Date: Jun 2018 Location: Los Angeles Posts: 4	12 Bolt Differential ID Identification Help I am trying to figure out where the differential on my 1969 C10 Step Side has. I have gone through the search on the board and the other postings I found do not match anything on my differential. That being said here is what I have stamped on it. Passenger Side THC W138 2 NF3896838 Driver Side GM 61 CN3 I tried attaching the pictures but for some reason it says missing token. Here is a link with the pictures any help is appreciated. https://www.dropbox.com/sh/g6ds1jezx...ZlisreP2a?dl=0 Last edited by ADimas; 08-21-2018 at 04:09 PM. Reason: Pictures

08-21-2018, 08:09 PM	#2
AtomicYJ Registered User Join Date: Feb 2010 Location: Richmond Hill, GA Posts: 64	Re: 12 Bolt Differential ID Identification Help Looks like a standard 12 bolt truck differential. Used from '63 or so until '81. __________________ 1957 Chevy 3200 1971 Jeep CJ-5 Renegade II 1983 Chevy K/10 Silverado 1985 Jeep CJ-8 Scrambler

08-22-2018, 12:27 AM	#3
PepperTreeGarage Registered User Join Date: Jan 2014 Location: SoCal Posts: 281	Re: 12 Bolt Differential ID Identification Help Hope this helps~~~~~ Attached Images

08-22-2018, 08:12 AM	#4
uncle Senior Member Join Date: Aug 2003 Location: Conyers,Ga. Posts: 7,288	Re: 12 Bolt Differential ID Identification Help THC code shows 71 model rear 3:73 non posi.

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