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Username Post: Ratio/assembly stamping on 64 ONLY rearends        (Topic#359409)
DZAUTO 
Member #51
Posts: 8766

Loc: Mustang, OK, USA
Reg: 12-25-99
01-07-20 08:54 PM - Post#2783959    

A question came up on another forum, and I have understood the answer, but I asked the question to Verne Frantz, which he confirmed.

The 55-64 rearend center cases have the casting number and casting date on the driver side of the case. The ratio code and assembly date (day-mo only) are STAMPED on the passenger side of the case. But there is an exception to 1964 rearends. As I've understood for several years, the STAMPED ratio/assembly date was NOT done on 64 center cases. For 1964 only, the ratio/assembly date was stamped on the FRONT of the RIGHT axle tube.

This brings us to my inquiry. For those of you here that have a 1964 model, if you ever should have the opportunity, can you check to see, and report back here, if your 64 center section DOES NOT HAVE the ratio/assembly date on the right side of the center case, and look to see if it is stamped on the front of the right axle tube.
Thanks.



 


DZAUTO 
Member #51
Posts: 8766

Loc: Mustang, OK, USA
Reg: 12-25-99
01-07-20 09:08 PM - Post#2783960    
    In response to DZAUTO

And this brings up another interesting thing. Does anyone have a rearend, or have ever seen a rearend with a flat pad like this on the passenger side of a center case? I've been rebuilding these rearends for over 50yrs, and I've only seen a handful of rears that had this flat pad.

This would be a 3.36 posi from the Buffalo plant.


Attachment: IMG_2693.JPG (547.18 KB) 2 View(s)






 
4spd409 
"13th Year" Silver Supporting Member
Posts: 614
4spd409
Loc: Sherwood ND
Reg: 10-10-02
01-08-20 07:36 AM - Post#2783979    
    In response to DZAUTO

This is a little off subject but years ago I parted out 2 1964 Bel Air 4 door sedans. Both cars were 6cyl 3 speeds. I was happy to see the P on the center section only to find open rearends in both cases. Both cars were late production, July. Everything looked factory with the dates on the ring gear being appropriate for the July casting date. I don't remember if the center section was stamped with a code. With this style of rearend going out with the 65 production were they just using up P cases?

61 Impala Bubbletop


 
DZAUTO 
Member #51
Posts: 8766

Loc: Mustang, OK, USA
Reg: 12-25-99
01-08-20 09:19 AM - Post#2783987    
    In response to 4spd409

  • 4spd409 Said:
------------------------- ------------------------- ---------------- With this style of rearend going out with the 65 production were they just using up P cases?



I have frequently wondered about this question myself!!! It seems like a real possibility that rears were assembled with parts that needed to be used up.
Once upon a time, AT LEAST 35yrs ago, while going through a salvage yard, I ran across a very plain jane 64 2dr Biscayne that had a P-case. But I had no tools to pull a rearend. Plus, the desirability of a P-case back then was not as big as it is today. So I just went on and never tried to go back to get it. Probably could have got it for $25-50.



 
Verne_Frantz 
Member #574 "61-64 Subject Matter Expert"
Posts: 5659
Verne_Frantz
Loc: Hightstown,NJ USA
Reg: 08-22-00
01-08-20 07:44 PM - Post#2784026    
    In response to DZAUTO

Tom,

I've noticed the raised pads for the stamping on several 3rd members. I'd have to go do a lot of digging to see which dates and/or manufacturer they were. I never documented them when I cam across them.

Verne



 
dogdish 
Senior Member
Posts: 439

Loc: Suburban Chicago
Reg: 11-25-05
01-09-20 09:38 AM - Post#2784049    
    In response to Verne_Frantz

Tom, I have a 64 Belair and can confirm my left (driver side)axle tube is stamped.

Bob G.
1964 Belair barn find
409/4speed NOM
8700 orig. miles
never restored


 
DZAUTO 
Member #51
Posts: 8766

Loc: Mustang, OK, USA
Reg: 12-25-99
01-09-20 10:20 AM - Post#2784056    
    In response to dogdish

  • dogdish Said:
Tom, I have a 64 Belair and can confirm my left (driver side)axle tube is stamped.



This just adds more credibility to the change from stamping ratio/assembly dates from the cast iron case to the axle tube in 64.
In years past, many people have said they CANNOT find a stamp on the right side of the center case. And it very well may be possible that the stamped numbers they were looking for were on a 64 case, which did not get stamped!
Now, if just more owners of a 64 car will check to see if numbers are stamped on the axle tube instead of the passenger side of the cast iron center case, we'll have a good consensus.
I've been rebuilding the 55-64 rearends for over 50yrs, and it has just been the past 5-7yrs that this detail has come to light. Thus, if a rearend case was cast Sep-later, for a 64 model car, OR, OR, OR, IF IT WAS A SERVICE REPLACEMENT that was cast after Aug-Sep 63, then it probably did not have a stamped code on the passenger side.

Here is a case, cast Jan 17, 64 with NO stamped code on the right side.



Attachment: IMG_2687.JPG (508 KB) 1 View(s)




Attachment: 100_4367.JPG (1.09 MB) 3 View(s)






 
62BillT 
"18th Year" Silver Supporting Member
Posts: 5826
62BillT
Loc: Moneta, VA
Reg: 09-24-01
01-10-20 05:53 AM - Post#2784116    
    In response to 4spd409

  • 4spd409 Said:
With this style of rearend going out with the 65 production were they just using up P cases?



Oh, no!!

I found a "P" Case Rear one day under a '64 Parts Car I have and decided I was going to save it for my '62 someday.

Now it may be a fake, lol?

The car is a '64 Impala 4-Dr Sedan with a 327 and a PG Trans.


Member:
-National Impala Association
-Vintage Chevrolet Club of America


 
DZAUTO 
Member #51
Posts: 8766

Loc: Mustang, OK, USA
Reg: 12-25-99
01-10-20 09:29 AM - Post#2784123    
    In response to 62BillT

  • 62BillT Said:
  • 4spd409 Said:
With this style of rearend going out with the 65 production were they just using up P cases?



Oh, no!!

I found a "P" Case Rear one day under a '64 Parts Car I have and decided I was going to save it for my '62 someday.

Now it may be a fake, lol?

The car is a '64 Impala 4-Dr Sedan with a 327 and a PG Trans.




If you have a P-case with NON-posi guts, it is an extremely super simple matter to add one of the aftermarket posi units (ie Eaton or Nitro Power Lock). If it were mine, I'd do it in a heart beat!!!!!!!!!



 
62BillT 
"18th Year" Silver Supporting Member
Posts: 5826
62BillT
Loc: Moneta, VA
Reg: 09-24-01
01-10-20 11:19 AM - Post#2784133    
    In response to DZAUTO

  • DZAUTO Said:
If you have a P-case with NON-posi guts, it is an extremely super simple matter to add one of the aftermarket posi units (ie Eaton or Nitro Power Lock). If it were mine, I'd do it in a heart beat!!!!!!!!!




OK, thanks Tom.

Member:
-National Impala Association
-Vintage Chevrolet Club of America


 
kingkreeton 
"6th Year" Silver Supporting Member
Posts: 1363
kingkreeton
Loc: Houston TX
Reg: 04-15-11
01-12-20 06:19 AM - Post#2784234    
    In response to DZAUTO

Here is a picture of the stamping I found on the front:

Rear End Stamping

Shane
64 Impala SS:
Chevy Performance 350HO
4 Speed Muncie

Proud member of Big Blue Nation, University of Kentucky Basketball. "Go Big Blue"


 
DZAUTO 
Member #51
Posts: 8766

Loc: Mustang, OK, USA
Reg: 12-25-99
01-12-20 08:39 AM - Post#2784241    
    In response to kingkreeton

That is NOT, repeat, NOT a stamping. That is CASTING numbers.
Here are examples of what the STAMPING looked like on the PASSENGER side.




Attachment: 100_4145.JPG (938.49 KB) 2 View(s)




Attachment: IMG_0371.JPG (1.86 MB) 1 View(s)






 
kingkreeton 
"6th Year" Silver Supporting Member
Posts: 1363
kingkreeton
Loc: Houston TX
Reg: 04-15-11
01-12-20 08:58 AM - Post#2784244    
    In response to DZAUTO

Sorry, just trying to help.

Shane
64 Impala SS:
Chevy Performance 350HO
4 Speed Muncie

Proud member of Big Blue Nation, University of Kentucky Basketball. "Go Big Blue"


 
Verne_Frantz 
Member #574 "61-64 Subject Matter Expert"
Posts: 5659
Verne_Frantz
Loc: Hightstown,NJ USA
Reg: 08-22-00
01-12-20 01:32 PM - Post#2784263    
    In response to kingkreeton

Tom,
I ran across a Feb '63 Buffalo rear that had the raised pad where the stamping is.

Sometime fairly soon, I'll be pulling several more rears out to look at them and we'll see if I find any others with the raised pad. (This time, I'll take notes!)

Verne



 
DZAUTO 
Member #51
Posts: 8766

Loc: Mustang, OK, USA
Reg: 12-25-99
01-12-20 01:37 PM - Post#2784264    
    In response to kingkreeton

  • kingkreeton Said:
Sorry, just trying to help.



You're fine, I'm just clarifying the difference between cast and stamped.
All that the casting number and casting dates provide is when the molten iron was poured into the mold, and which mold.
But STAMPED letters/numbers tell when it was actually built, gear ratio, car it went into, and plant.



 
Fossil_Fuel 
Frequent Contributor
Posts: 1047
Fossil_Fuel
Age: 60
Loc: Minnesota
Reg: 09-11-07
01-13-20 09:15 AM - Post#2784316    
    In response to DZAUTO

DZ
Confirmed on my late June (06D) ‘64 SS.

Casting is a 3725899 with F114 cast date
STAMPED on front of axle tube is AB 6 17

Craig

Craig
1964 Impala SS 327/300 since '76
1967 Impala SS 327 Triple Black Hardtop in the works
1967 Impala 327 Bench Seat 4-speed
http://craigaacars.shutterfly.com/pictures


 
DZAUTO 
Member #51
Posts: 8766

Loc: Mustang, OK, USA
Reg: 12-25-99
01-13-20 11:25 AM - Post#2784328    
    In response to Fossil_Fuel

Obviously, I have not inspected the rear axle assembly on all 1964 Chevys. But from what I have seen, as I mentioned above, it APPEARS that GM stopped stamping the ratio code (2 letters) and assembly date (3-4 numbers) on the center casting and moved the stampings over to the axle tube on the 1964 models.
What ORIGINALLY prompted my attention to this change in stamping location was that SOME center cases did not have the code/date stamped on them. And then just by chance, I noticed the absence of stampings was most commonly on the 64 cases. And again, by chance, I noticed some 64 axle housings had the ratio code/assembly date stamped on the axle tube. An AH HA moment.
And this fits with the rearends on other style 64 models, such as 64 ChevyII and 64 Chevelle rear axle housings. Those DO NOT have a removable center section. Instead, the 64 ChevyII and 64 Chevelles (and other GM models such as Pont Lemans, Cutlass, Regal, etc) have a large cast iron center section with the axle tubes pressed into the center section and their stampings are on the tubes. So, I'm presuming Chev followed the same with the 64 full size rears ------------------------- - which of course was the last year for a drop out center section.

Below is the difference in housing types.


Attachment: 100_1378.jpg (78.25 KB) 1 View(s)




Attachment: 100_2929.jpg (78.64 KB) 4 View(s)




Attachment: 100_4465.JPG (1.2 MB) 2 View(s)




Attachment: DSCN1280.JPG (4.38 MB) 3 View(s)






 
Verne_Frantz 
Member #574 "61-64 Subject Matter Expert"
Posts: 5659
Verne_Frantz
Loc: Hightstown,NJ USA
Reg: 08-22-00
01-13-20 01:36 PM - Post#2784336    
    In response to DZAUTO

Here's an example from a '64 Belair.
Coded as a 3.36 open rear assembled on Feb 11th.

Verne

Attachment: Axle_tube_stamp.jpg (1.09 MB) 2 View(s)






 
MrImpalaMan 
"6th Year" Silver Supporting Member
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MrImpalaMan
Age: 54
Loc: Jefferson City Mo
Reg: 10-16-12
01-20-20 10:22 AM - Post#2784727    
    In response to DZAUTO

Here’s the stamping from my 64, can you tell me what it means?

Attachment: B43AAC79-6742-4BBD-96B9-B27265DE1D6D.jpeg (2.58 MB) 3 View(s)




Paul
1964 Impala SS 327 4 speed


 
DZAUTO 
Member #51
Posts: 8766

Loc: Mustang, OK, USA
Reg: 12-25-99
01-20-20 01:52 PM - Post#2784747    
    In response to MrImpalaMan

Is that BB0603?



 
Verne_Frantz 
Member #574 "61-64 Subject Matter Expert"
Posts: 5659
Verne_Frantz
Loc: Hightstown,NJ USA
Reg: 08-22-00
01-20-20 02:12 PM - Post#2784753    
    In response to MrImpalaMan

Could you also supply the casting date on the other side of that rear?

thanks
Verne



 
MrImpalaMan 
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MrImpalaMan
Age: 54
Loc: Jefferson City Mo
Reg: 10-16-12
01-21-20 03:24 AM - Post#2784786    
    In response to DZAUTO

That's what I thought it was. Can't really make out the 3 very well.

Paul
1964 Impala SS 327 4 speed


 
MrImpalaMan 
"6th Year" Silver Supporting Member
Posts: 371
MrImpalaMan
Age: 54
Loc: Jefferson City Mo
Reg: 10-16-12
01-21-20 03:25 AM - Post#2784787    
    In response to Verne_Frantz

Yes I can, I'll try to get it tonight or soon.

Paul
1964 Impala SS 327 4 speed


 
DZAUTO 
Member #51
Posts: 8766

Loc: Mustang, OK, USA
Reg: 12-25-99
01-21-20 07:40 AM - Post#2784802    
    In response to MrImpalaMan

If it is BB0603,
Then the BB translates to 3.36 NON-posi, built at the Buffalo (NY) plant.
The 0603 translates to an assembly date of June 3.
The CASTING date is on the driver side of the case and it will include the year.

Here is an example of a casting date for 1964. Even though this is a Positraction case (big P), the casting date coding will follow the same pattern. The A1764 translates to Jan 17, 1964. You should be able to find something similar to this on the driver side of the case.



Attachment: IMG_2687.JPG (508 KB) 0 View(s)






 
MrImpalaMan 
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MrImpalaMan
Age: 54
Loc: Jefferson City Mo
Reg: 10-16-12
01-21-20 02:37 PM - Post#2784832    
    In response to DZAUTO

Here are the casting numbers from the drivers side of the case.

Attachment: 00EB3E26-B370-4652-A757-E8FB53030E2D.jpeg (2.38 MB) 1 View(s)




Paul
1964 Impala SS 327 4 speed


 
Verne_Frantz 
Member #574 "61-64 Subject Matter Expert"
Posts: 5659
Verne_Frantz
Loc: Hightstown,NJ USA
Reg: 08-22-00
01-21-20 06:50 PM - Post#2784849    
    In response to MrImpalaMan

That's a good find. With a casting date of F 1 64 (June 1st '64) we have a '64 rear with an assembly stamp on the 3rd member. Since it's still in the housing, it would be interesting to know if the assembly stamp is also on the axle tube (as most '64s are).

Verne



 
DZAUTO 
Member #51
Posts: 8766

Loc: Mustang, OK, USA
Reg: 12-25-99
01-21-20 07:57 PM - Post#2784854    
    In response to Verne_Frantz

Thus, the differential case was cast Jun 1, 64 and it was assembled 2 days later, with a 3.36 non-posi ratio on Jun 3, 64.

As Verne mentioned, can you check to see if any numbers are stamped on the forward side of either axle tubes, such as in Verne's picture above.



 
MrImpalaMan 
"6th Year" Silver Supporting Member
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MrImpalaMan
Age: 54
Loc: Jefferson City Mo
Reg: 10-16-12
01-22-20 03:29 AM - Post#2784864    
    In response to DZAUTO

Yes I'll check.

Paul
1964 Impala SS 327 4 speed


 
Verne_Frantz 
Member #574 "61-64 Subject Matter Expert"
Posts: 5659
Verne_Frantz
Loc: Hightstown,NJ USA
Reg: 08-22-00
01-22-20 07:56 AM - Post#2784881    
    In response to DZAUTO

It's also interesting to note that the '64 P case does not have the raised pad where the assy date would be, but this non-P case does have the pad.
We may have uncovered a trend. We just need more samples.

Verne



 
DZAUTO 
Member #51
Posts: 8766

Loc: Mustang, OK, USA
Reg: 12-25-99
01-22-20 08:18 AM - Post#2784882    
    In response to Verne_Frantz

  • Verne_Frantz Said:
It's also interesting to note that the '64 P case does not have the raised pad where the assy date would be, but this non-P case does have the pad.
We may have uncovered a trend. We just need more samples.

Verne



Mmmmmmmmmmmmmm, did I open a can of worms by starting this?



 


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