RearEnd Upgrade?

[Titus0]

Hi, Im new to 67-72 C10 world and have recently purchased a 1967 C10, 2wd Short Cab. Me and my Dad have slowly been fixing it up and we've ran into a bit of a problem in the rearend department. When we bought the truck we were told it had a 12 bolt out of a chevelle "not sure what year", but were not sure if it is. Ive found a few numbers off of the pumpkin and axles etc, but ive been unable to determine excatly what it came out of. The numbers are as followed. On the driver's side front side of the pumpkin, Gm 53. On the passenger's side front side of the pumpkin, NF3896838. On the axle housing itself, 12345 67890. Could someone please tell me what this rearend is out of or direct me to where i can find out please...

[special-K]

Hello and welcome to the site.I can't help with the numbers,but are you sure it's not just the original truck rear?If it came from a car it would have been modified to mount.Can you see that it was altered?What is the issue with the rear?

[Titus0]

Yeah im sure it's not factory, as the 67 C10 didn't have a 12 bolt option. And the issue is im going to rebuild it and need to know if its a car 12 bolt or one out of a later model c10. Im purchasing a new eaton limited slip and just wanted to know for sure what the rearend was before i started buying upgrades. ty

[Alvin]

Did a google search on NF3896838 and all the results are 67-72 trucks, so it looks like you've got a truck axle!

[Titus0]

Thanks for the replies, however ive found the casting number NF3896838 also associated with novas, camaros, as well as chevelles.. In the end i suppose a custom rear end guy wouldnt have a problem making what i get work i was just curious if anyone new exactly what it came out of.. again ty for the replies

[brad_man_72]

my 67 c10 came with a 6 lug 12 bolt........

[Titus0]

Ok so i read somwhere the 12bolts weren't available in the c10s till 70.. my bad... that still doesnt tell me if its factory.. this truck has had alot of mods done to it over the years so.. what were the numbers off ur pumpkin brad man?

[special-K]

Got pictures of it?That would help.These Chevys ran 12-bolts and they differ from the car version.

[Hart_Rod]

On the top of the passenger side axle housing there should be series of numbers/letters that should help you decode it. This site has some good information:

http://www.gmcpauls.com/67-72_chevy.htm

[cdowns]

easy way to tell if car or truck 12bolt is by the bolt pattern// a car like nova camero or chevell will b 5X4.75 trucks had 5X5 or 6lug rears

[Lippyp]

My 67 has a six lug 12 bolt rear end.

[brad_man_72]

sorry my factory 12 bolt is at board member bobbos house. Like stated above if it's six lug it's definitely a truck rear probably the fatory rear end.

[Titus0]

Ok so i checkd the bolt spacing and it was 5x4.75, so if what Hart Rod is sayin is true its a 12bolt from a car.. Also i found the numbers on top of the passenger side axle housing and they are as follows. 2N1190ADT, but after a google search etc. i found no info on these.. Again ty guys for the replies, i think im gettin close to solving the rearend mystery..

[Titus0]

And yeah ill post some pics later of it Special K, as well as of the truck in general, but unfort i have work for now..

[raycow]

A car 12 bolt will have a perfectly round cover, while a truck 12 bolt cover is irregular-shaped. Also, a Chevelle rear will have two large cast lugs on the top side where the upper control arms attach.

Ray

[Fitz]

Originally Posted by raycow

A car 12 bolt will have a perfectly round cover, while a truck 12 bolt cover is irregular-shaped. Also, a Chevelle rear will have two large cast lugs on the top side where the upper control arms attach.

Ray

The 12 bolt passenger car differential cover is on the left and the 12 bolt truck cover is on the right.

[eagleuh1]

Allright, another Arkansas member. And from Bills hometown. Don't know if thats a good thing or not though. Welcome. And another vote for pics..

[Titus0]

Ok cool, thanx ray and fitz.. mine is deff a truck rearend after looking at it...
And hey Eagle, i actually lived in russelville for 6 years and my gf still does lol, i drive my 67 up there all the time. And as far as pics goes ive tried to upload a few but havent figured it out yet lol, wants me to use a url which i dont understand.. any info on how to post pics would be great.. again ty for the posts guys, been really helpful

[special-K]

I'm not good with computers or knowing what all this URL/IMG code is.There was some tutorial here on using Photobucket and that worked for me.I know there are other hosts but I got one figured out and that's as far as I got.It resizes pictures to whatever is required on this site and elsewhere.I know once you upload pictures there,you use the bottom code that pops up when you hold the curser over the image.You do the right click and hit "copy",then come on your post,right click,and hit paste.That's it,if I didn't forget something

[eagleuh1]

I use photobucket for mine. And SpecialK's directions sound about right. Once you've downloaded the pics from your computer to photobucket, you can add titles and other history to each pick. When you want to link to the pic on photobucket you go to the image code under the pic and click on it. It will tell you its been copied. Then just paste it in to your post on here. Looking forward to the PICs. Good luck. Theres a couple more 67-68 trucks for sale going up Hwy7 I looked at yesterday. A 67 Lwb, red. He wants $1500. The others a 68 SWB stepside, black. The guy wasn't there to ask about price though.

[ERASER5]

When measuring bolt patterns,always remember it is outer to center NOT center to center. As Longhornman would say," I'd bet a kick in the daddy parts" you measured center to center and got 4.75" insted of 5."

[raycow]

Originally Posted by ERASER5

When measuring bolt patterns,always remember it is outer to center NOT center to center.

That's on 5 lugs only. If you have 6, 8, or any other even number, measure center to center.

Ray

[ERASER5]

Originally Posted by raycow

That's on 5 lugs only. If you have 6, 8, or any other even number, measure center to center.

Ray

I knew I forgot something! Good thing the OP was measuring a 5 lug. Thanks for the fix.

[Titus0]

Ok so i remeasured the lug spacing and it is in fact a 5x5, so deff a truck rear end on the basis of pumpkin shape and bolt spacing.. Thanx so much for the help guys, i can go forward on replacements now!

[Titus0]

tryin to see if this photo bucket thing is working lol, so test...
[IMG]<a href="http://s1141.photobucket.com/albums/n586/Titus011/?action=view&current=DSC01415.jpg" target="_blank"><img src="http://i1141.photobucket.com/albums/n586/Titus011/DSC01415.jpg" border="0" alt="Photobucket"></a>[/IMG]