[JCBINC7]

I need a rear for my GTO but can not find what the casting code should be. Does anyone have any info or a sight I can go to to find the code ? I know the axle code is YH and the date is J,K or 1st week of L if anyone has a lead on one. Thanks

[dld]

Casting #9779822 date code is next to it is. letter day year k 12 4 ect.

64 car is different......66 up is wider........65 one year only!

[JCBINC7]

When I google that code it comes up as an Olds rear. The guy who has the rear says it has only 1 rib on each side of the carrier which shows to be a Buick rear.

[JCBINC7]

Could that attachment showing the 3 style rears be for years other than 1965 ?

[dld]

What I wrote my be the only thing I know about a GTO. LOL
Not sure if Olds shared it or not. They call them BOP rears?

There were different foundry's casting cases and there were up dates. You may see a larger 1 or 2 or 3 ect. on case. But this is not important. If you are looking for a date code to match your Dec car.

If its wrong some one will chime in

[John V.]

I have an available '65 Pontiac rear, but a May '65 date code. I believe it is stamped for a 2.78 axle ratio IIRC.

Olds for sure and maybe Buick also apparently did share the same center casting.

9779822 is a Pontiac engineering issued part no. It is for the casting only and does not identify the Axle Tubes & Diff Housing assembly.

What I do not know is whether Olds (or Buick) used different axle tubes pressed into the center casting. So I cannot say if a '65 Olds Cutlass rear Housing is completely identical to the Pontiac. Possibly same Housing Assembly but different ring & pinion gears were offered, I just don't know anything about Olds to be sure.

The stamped codes will be different for sure but that is a trifling matter.

If all the dimensions are correct, then I would say it will work for you.

If you need dimensions to compare it to my Pontiac Housing just ask.

[JCBINC7]

Is that a picture of your rear from your 65 or a picture you found online ?

[dld]

Picture is from file.

I have 64 and 65 housing and a 70. all are different in some way. But all these will bolt in.

64-65 is 54.25" flange to flange.........66 up is wider 3/4"

The gears and case interchange. Case is different for different gear ratio's. Check with people that sell gears and cases for interchange.

[dld]

More help. Note date. This casting # 54.25" wide and you found the correct housing. Gears and carrier you may have to change.

[JCBINC7]

Is the rear for sale or another one that you have ?

[dld]

Ask John V first He was first to post one. But the 64 I will sell. Have housing only.

[JCBINC7]

Johns is dated for May, I will need a oct,nov or early dec of 64. What is the date and axle code on your 64 ?

[dld]

My 64 rear is cast in 63. Yes you need the housing that I posted pic of. Thats for my 12c 65 car. Sorry.

[dld]

Remember if its about the correct Date the 64 rears won't help you, diff. casting # and they look way different. You need 9779882 casting. The year is cast in the housing remember.

[JCBINC7]

Any chance at all to purchase your 65 housing ? Maybe put an inflated price on it.

[JCBINC7]

What is the gear ratio code ?

[dld]

No .......can't help With that. Will PM u if find something u can use.

[gtobreaux]

Originally Posted by dld

Ask John V first He was first to post one. But the 64 I will sell. Have housing only.

Is the casting code for your 64 housing 9772969? What is the date code, please? Thanks, JBA

[JCBINC7]

This rear is for my 65 GTO. The casting code is 9779822 and the date I need is K or early L of 1964 with a gear ratio code of YH.

[dld]

PICTURES Very few pits in tubes.