VIN verification

[bertfam]

Ed, I was told that everything is model year stamped except the trans. they were stamped calendar year, so I thought this trans was stamped 6 weeks before the car build date.

No, that's not correct. The transmission is stamped model year.

Ed

[jdv69z]

Here's a pic of my original Muncie in my 69 Z. Note the assembly date P9P11 indicating model year 69. but below is the main case casting date of I3 8. So main case was cast in  Sep 3 68, and trans was assembled Sep 11 68. Part of your partial main case casting date shows up in the pic, but not the year. If it's as Ed suspects, it's a 7. Or maybe the 7 in the pic you provided is the year the main case was cast?

Note that my Z is a 1968 10B build just as yours is.

[bcmiller]

Here's a pic of my original Muncie in my 69 Z. Note the assembly date P9P11 indicating model year 69. but below is the main case casting date of I3 8. So main case was cast in  Sep 3 68, and trans was assembled Sep 11 68. Part of your partial main case casting date shows up in the pic, but not the year. If it's as Ed suspects, it's a 7. Or maybe the 7 in the pic you provided is the year the main case was cast?

Note that my Z is a 1968 10B build just as yours is.

That's not a casting date. It may somewhat line up for that particular case, but I just checked 15 cases that I have here at home and none of them line up that way.  Attached is an example of a 69 case.  There is no real rhyme or reason for the numbers that relates to date as far as I know.  It MIGHT have to do with the casting mold number.

[bertfam]

It MIGHT have to do with the casting mold number.

Yep. It's a foundry pattern number used to track the mold the pattern was made from in case there were problems found.

If you want to know the month and week the individual parts (main case, extension housing and/or side cover) were cast, look for two circles as shown in the picture below. (Sorry, no year indicator, but you can always go by the casting numbers)

In this case (this is an extension), it was cast in the 3rd week (3 dots) of March (3). The other circle will contain a blueprint number and a deviation notice letter (usually, it's blank).

Ed

[BULLITT65]

Here is an old link describing the car:
http://www.soldbyauctions.com/homes/advert_details/JiwzNFgtI0RYCmAK/
Looks like it was silver at one point.

[jdv69z]

So much for my theory!  So the casing don't have a casting date? Ok, got it now.

[bertfam]

Sorry Jimmy. I was updating my post to include casting date indicators while you were posting. See the picture above.

Ed

[jdv69z]

Yes, I see the circles on the side cover, for example, just like you stated.

[BobH11]

So what I'm getting is transmissions were built a year in advance of the assembly date stamp.

[bertfam]

So what I'm getting is transmissions were built a year in advance of the assembly date stamp.

No, transmissions were built on a daily basis and shipped to the various assembly plants for immediate installation. A "typical" date will only be a few days to several weeks before the car assembly date. I think you're getting confused on the MODEL YEAR stamp.

For example... Let's say you have a 1969 Camaro assembled in October of 1968 (remember, the new model year started in August, so the 1969 Camaro actually went on sale in August of 1968). The transmission would probably be built in September of 1968, but since it was destined for a 1969 car, the stamp would be P9xxxx. The transmission year stamp was always the MODEL year, not the CALENDAR year it was actually built.

Does that help?

Ed

[bcmiller]

Not many main cases have those date marker circles, WITH DATES indicated. Side covers and tail housings usually do.

[jack92584]

Here is an old link describing the car:
http://www.soldbyauctions.com/homes/advert_details/JiwzNFgtI0RYCmAK/
Looks like it was silver at one point.

And here is the link to the actual Russo Steele auctions results. It has a few more pics of the car when it was silver. Also mentions the rear axle not being original to the car
https://russoandsteele.com/vehicle-details/?show_vehicle=16981&current_index=4&total_results=11&auction_pk=51&=&caryear=&caryearto=&search_text=&page=&showpage=1

[BULLITT65]

So my question for the OP is : did you pay full price based on the seller saying it was all numbers matching?

[bcmiller]

Not many main cases have those date marker circles, WITH DATES indicated. Side covers and tail housings usually do.

Quick survey of 67-70 complete transmissions and main cases that I could find quickly at home.  10 main cases had no date circle at all, 5 had the date circle, but had no data in the circle.  None had a date circle with data in the circle.

[KurtS]

The trans is a restamp, as is the engine pad. IMO.