64 12 bolt open

I PICKED UP A 64 PANEL AND IT HAS A 12 BOLT TRUCK DIFF. IN IT. Not sure if its original because it has brake hoses coming out of the wheel cylinders. Any help appreciated

What do you need to know?- the vans did come with 12 bolt rears - my 65 has one.

There are casting dates; see if they end in "3" or "4" - that will give an indication if the rear matches the year of the van.

Two examples of casting Codes:( F 20 3 ),  ( J 15 4)
Looking from the back. Check the lower, right, rear side of the pumpkin, right adjacent to the rear cover.

Ok I will check that but do they have brake hoses from the wheel cylinders ? I thought the hoses were only used when the you need movement. Thanks !

Well, who know what the PO did - Factory was a hard line.
I believe I have the strait lengths if you need them...

I dont need any lines, thanks. Just wondering why there are rubber hoses going into the wheel cylinders. I ran steel lines to them and it works. The hoses thread into the wheel cylinder. My other 2 vans are 66s and they have the steel line going to the wheel cylinders directly. They are ten bolt diffs though. Are the 12 bolts supposed to be like that? I still have to try and find the ID numbers.

Not sure of the question - the 12 bolts are hard lined if that is the question.

yes that is the question, thank you. somebody changed something on this one that I have then.

For my reference - were the original Delco wheel cylinders still installed?  If so - would you share what casting numbers and piston size they are.  The numbers are raised cast numbers.

Size maybe 7/8  or 1-1/16
Casting something like this: 5462  965 and 5462  966

Dont see any wheel cylinder numbers. They are the angled bolt mounts. The housing numbers are B14 on the lower right of pumpkin.

Well that would be a pretty casting date Feb 1st 1964 - I would tend to believe it is the original rear

Can I put a 12 bolt truck posi carrier in it ? They require 30 spline axles, so id have to change them also.

I cannot say - but can offer a few things:
My parts book shows the '64 had 17 spline count - is that what you found? My '65 12 bolt is a 30 spline count & the vans did have an option for posi - So I can only guess it should be a go. Hopefully someone on the board with have experience.

Yes I have 17 spline. Can only find 30 spline 31 3/8 long CAR axles to fit. They say the outer bearings are different diameters.

Do you have a part number in your book for the 30 spline ? Maybe something would cross. Thanks.

3859321 --> replaced by 3914060
I maybe help you one better I have a spec sheet from my axle - I was going to go the new make route then found the repair bearing to use.
PM me your email address if you want a copy of the sheet.

I sent it.