Rear end ID help please 67 C10 Stamped #'s?

[charx2]

It's a GM 12 bolt with the following info
NF 3896838
GM 60
THA W 0832 2

If anyone can point me in the right direction or let me know....I have been looking on internet for 4 days and still can't find out exactly where it came from. It's on a 67 C10 but I'm not sure if it's the original. Car or truck? Any help would be greatly appreciated.

[DANTIP]

I believe I have the codes at home and will send you something tonight. The info looks complete.

Dan

[charx2]

Thanks alot, I really would appreciate it.

[neba]

i had same question a couple weeks ago. what someone pointed out is numbers might tell you what came from factory, but not always whats in there now. i took cover off and found gear ratio stamped on ring gear and a posi set up. if you do find codes i also would be interested to see if mine was ordered or changed at some point.

[charx2]

I pulled the cover and counted teeth awhile back, i believe I got 3.08, or was it 3.07?? Man I can't remember, my memory is shot!

[DANTIP]

My book claims it is a 1971 3.07 non-posi.

Is it a 5-lug diff?

Dan

[charx2]

Yeah, it's a 5 lug. I thought 3.07 were car rear ends?

[DANTIP]

3.07 was a very common gear for pickups. Good Luck!

[leddzepp]

3.07 is truck.....3.08 is car

[neba]

could you id mine? NF3896839 GM 53

[charx2]

Originally Posted by neba

could you id mine? NF3896839 GM 53

Those #s won't give you to much info, say your looking at your rear axle with your back under the trans. Go about 6 inches to the left of the pumpkin at about the 2 O'clock position and start scrubbing. I used sand paper and clean paper towels. It literally has to be SHINEY clean to see it. It's stamped with a die not cast.

[DANTIP]

That's a good description of the location. Here is a graphic of it (disregard the casting number info).

[neba]

will try to find the stamped numbers. thanks

[VWNate1]

Wow Dan ;

That's a great diagram .

Any chance of a link to decode the numbers ? .

When I worked in GM Dealers, we had scads of books to decode anything .

[LockDoc]

Originally Posted by VWNate1

Wow Dan ;

That's a great diagram .

Any chance of a link to decode the numbers ? .

When I worked in GM Dealers, we had scads of books to decode anything .

This may not cover everything but it covers most of them....

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

LockDoc

[Tx70Gmc]

can anyone help identify mine?
I do realize this is a very old thread, but figured it was worth a shot.

67890 - GM 12 bolt
E120 - May 12, 1970
NF3896838

Axle Stamp = TDA 0521W1

so I think the TDA means its a 3.73 gear and i think the 052 is the 52 day of the year it was built? and i have no clue what the 1W1 means?

any ideas?

Thanks,