[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.

[John V.]

dld, that Housing is really throwing me for a loop. Is it for sure an A-Body Housing?

The p/n on the casting really threw me, 9773722 was a Pontiac p/n, but not one I'm familiar with. The p/n "vintage" certainly seems correct for the '64 Model Year and the I33 cast date is a good cast date for an early built '64 (Sept. 3, '63).

The '64 A body Housing that I'm familiar with has p/n 9773369 on it, although they were not raised cast as you see on your 9773722 Housing or the '65 A-Body 9779822 Housing.

I don't think the 9773369 was stamped, I think it was cast that way, but it will appear "debossed" as if it was stamped, rather than raised character. There is what appears to be a cast date code but it is not the same code style as used on this one, rather it may have been a Julian type so that it might read 114 for the 114th day of 1964 (perhaps a day in April?).

The first time I learned that the '64 Housing even had a p/n on the casting was in this thread:

http://forums.maxperformanceinc.com/...hlight=9773369

Chronologically, 9773369 was issued before p/n 9773722. But the early cast date on yours would suggest this is not a superseding p/n.

Possibly, as was done with some other components, it may represent an alternate p/n that was cast using different metallurgy which allowed for different foundries to supply the part.

So now, I'm very curious.

Is the numeric axle ratio code stamped near the vent with a P prefix?

Does this 9773722 Housing have the ears for the small bushings, same as the 9773369 Housing?

Does anybody else have the 9773722 Housing installed in an original '64?

I wonder if the Final Assembly Plant had anything to do with which Housing was used?

gtobreaux, you ask if the p/n was 9772969, where did you come up with that p/n?

[dld]

John

I got this rear housing at Carlisle flee market. Along with it were a lot of 64 parts. The vendor said he was parting out a 64. Half of it was there.

I measured housing ,it is same as 882 housing 54.25" flange to flange.

No stamp on tube. But I thought 64 and early 65 color coded backing plate and axle center to ID ratio and type?

Yes has small upper bushings

I also heard that there were several foundries and the # 2 3 4 ect. was to ID the series of housing?

[John V.]

If by "series" you mean a revision to that p/n, I suppose that is possible. It might also mean a particular mold, but revision no. also works for me.

Since the same housing was used regardless of internal gear, it should not have anything to do with the "series" of the Differential Carrier which was internal to the Housing (the Diff Carrier "series" depended on the ring gear being used).

I'd sure like to know if anybody else has ever come across this p/n on a '64 Housing.

You say it measures 54.25" flange to flange. Did you measure straight thru the axle tubes and did you include the thickness of the axle flanges on the end of the tubes?

If you read the thread I linked, the '64 9773369 and the '65 9779822 housings that I have all measure 54.50" flange to flange.

1/4" narrower doesn't seem like much, but still would be strange to me and I think an awful lot to be considered a "tolerance" error.

And you say it is same dimension as a 9779822 but that doesn't check against mine which measures 54.50".

Since it is a Pontiac p/n on the casting, it sure seems correct. But the lack of a ratio stamp code makes id'ing it as having originally come from a '64 Pontiac A-Body difficult.

Would sure like to hear if others have this casting under their '64.

According to a Chevelle site, the '64-'67 Chevelle rear Housing (Chevy p/n 3839390 in '64) measured 54.25" flange to flange.

Now perhaps it really was narrower than the Pontiac housing by 1/4" or maybe my measurement is off or the common wisdom is off.

But there is the possibility that your Housing was a Pontiac p/n assigned to a part that Pontiac could produce for Chevy. In '64, Pontiac issued a p/n for a Frame that was specified for the Chevelle. Not trying to throw any doubt on the correctness of your Housing for the '64 Pontiac A-Body application, just grasping for explanations about a part I have never seen or heard of.

My bearing caps aren't accessible but I happened upon a thread about a 9779822 '65 Housing and the Bearing Caps in it show p/n 9773721! No surprise that the matching bearing caps were issued a p/n in consecutive order with the cast Housing section that you have and carried over for use in the '65 rear.

I wonder what cap p/n is in my 9773369 rears?

Another '64 mystery, I love it!

[dld]

well ???? I did measure from outside backing plate flange to o/s. Straight across backside (no cover) on housing. My 65 822 housing is the same.

When I used the term series I meant the casting design.

I think it is more possible that instead of Chevrolet it would share with Olds and Buick.
There is also the chance you 369 housing was from a 63 f85 or a skylark.

Your idea of plant use could be correct. The Balto. plant build olds half year in 64 and Buick the entire A body run into the early 70's. These were on the very same line. The BOP cars shared the same ratios I think ? This would cut down on inventory and cost.

One other point the vendor I bought housing from only had the parts of the 64 car set out. No sure thing but looked like it was from that car. The bushings also were the 64 small type.

[JCBINC7]

I have a question about the 64 and early 65 GTO rearend coding. Did they not come with a stamping on the axle tube. I spoke to a guy today with a L164 date on his rear, but he said there was not a gear ratio stamping on the axle tube.

[gtobreaux]

[QUOTE=John V.;4060351]dld, that Housing is really throwing me for a loop. Is it for sure an A-Body Housing?

The p/n on the casting really threw me, 9773722 was a Pontiac p/n, but not one I'm familiar with. The p/n "vintage" certainly seems correct for the '64 Model Year and the I33 cast date is a good cast date for an early built '64 (Sept. 3, '63).

The '64 A body Housing that I'm familiar with has p/n 9773369 on it, although they were not raised cast as you see on your 9773722 Housing or the '65 A-Body 9779822 Housing.

I don't think the 9773369 was stamped, I think it was cast that way, but it will appear "debossed" as if it was stamped, rather than raised character. There is what appears to be a cast date code but it is not the same code style as used on this one, rather it may have been a Julian type so that it might read 114 for the 114th day of 1964 (perhaps a day in April?).

The first time I learned that the '64 Housing even had a p/n on the casting was in this thread:

http://forums.maxperformanceinc.com/...hlight=9773369

Chronologically, 9773369 was issued before p/n 9773722. But the early cast date on yours would suggest this is not a superseding p/n.

Possibly, as was done with some other components, it may represent an alternate p/n that was cast using different metallurgy which allowed for different foundries to supply the part.

So now, I'm very curious.

Is the numeric axle ratio code stamped near the vent with a P prefix?

Does this 9773722 Housing have the ears for the small bushings, same as the 9773369 Housing?

Does anybody else have the 9773722 Housing installed in an original '64?

I wonder if the Final Assembly Plant had anything to do with which Housing was used?

gtobreaux, you ask if the p/n was 9772969, where did you come up with that p/n?

After rechecking the unit in storage, the number is actually 9773369, with Julian date 323 (October 19, 1963) - the vehicle build date is 10B - which doesn't seem to fit