Re: The build date project
 

All from yesterday and today added except for 2 GMC’s that I need to figure plants out. Thanks for the leg work 402bowtie!

Re: The build date project
 

I'm happy to help, and it's an interesting project. I have a few trucks I'd like to extrapolate their build dates, so it will help me too.

Does this link help on the gmc plant question you mention?

Re: The build date project
 

Yes sir that’s a good resource. I was actually looking for it earlier but was only getting the combined Chevy and GMC one. Thanks!

Re: The build date project
 

GMC’S added. Tomorrow I’ll get to the PM’d info I’ve got and what ever else comes up here.

Re: The build date project
 

Couple more I found today.

In picture order:
72 chevy Blazer--2F166599; 4/72
72 chevy suburban--2F156196; 3/72
70 chevy Blazer - reproduced sticker (restored Blazer), 0S145151; 1/70
72 GMC - 2F710613; 5/72
72 chevy - 2S175704; 4/72

Re: The build date project
 

This is really turning out, thanks for the effort. Still can't zero my 72 Fremont 146xxx down to a single month, but pretty close. Fremont was really pushing them out too, they may have approached 9K a month at the time.

Any chance 71/72 Chevy Fremont trucks were the most plentiful?;) The results so far seem to imply so, perhaps age just caught up to 67-70.

Without specific dates you can't tell how many were produced per month, but here's where my 72 C20 would fall for Fremont, as a guide.......146xxx would be Feb. or Mar.

135708 Jan.
153077 Mar. Increased by 17369
161544 April Increased by 8467
164046 April Increased by 2502
168790 May Increased by 4744

Re: The build date project
 

I'm thinking Flint trucks may have been most plentiful (at least in '72) based on several VINs found online that start with a "3" after the "F" in the vin....as in 200,000+ (the first one started at 100,000) serial numbers for '72 Chevy Flint trucks. Just haven't been able to correlate build dates with those VINs that I am seeing.

Re: The build date project
 

Personally I wonder if it’s more that the Fremont trucks were being mainly sent to dry climates being they were produced in the west, and are the ones that have better survived.

I’ll get on the additions this evening.

Also, the original thread has been closed.

Re: The build date project
 

It may be helpful to reference the source of the info when updating the first two threads. For example, noting if it came from a PM or which post # the info is pictured.

Here's one I found that may be slightly out of order with another data point (post #68).

72 chevy
2Z163961
I believe build date shows 4/28/72

Re: The build date project
 

1970 GMC St Louis truck

1970 chevy Tarrytown

Re: The build date project
 

The truck from post 68 is blurry, likely 4-28-72 as it is within 85 trucks of this one. Certainly within the possibility of being on the same day?
If so, these are the first two I remember confirmed from the same day.

Re: The build date project
 

Yes, I think it is possible they were from the same day, given the blurriness of the one photo.

Does anyone know how the "job sequence number" (see very top left of build sheets) impacted production?

The truck in post #68:
Serial Number: 2Z164046
Job Sequence Number: 03114

The truck in post #89
Serial Number: 2Z163961
Job Sequence Number: 03x09 (guessing 03009, or less likely 03809)

It is interesting that even though the serial numbers are 85 numbers apart, the job sequence numbers appear to be at least 105 off from each other.

I'm wondering if it is possible that a certain batch of serial numbers started on a given day and then received their production date when finished assembling. If there were multiple assembly lines, perhaps some lower serial numbers could actually have a slightly later assembly completion date. ...just thinking/guessing out loud.

Re: The build date project
 

Awesome work guys, that’s a great first milestone.

Re: The build date project
 

These are from an old thread on the board. Most on that thread appear to already be captured within the first two posts here or have illegible pictures.

70 GMC; SZ68109; 3/70

70 chevy; 0Z142486; 2/70

70 chevy; 0S138xxx; 12/69

70 chevy; 0A158364; 7/70.....this one was already on the list but had incorrect date.

72 chevy; 2F355033; 3/72... Original decal and reproduction decal found at link above.

Re: The build date project
 

I added the others but this one does not follow correct sequencing for Chevrolet. Is it potentially a GMC?

Re: The build date project
 

Are you referring to the "3" after the "F"? That threw me off too. But I think Flint produced a lot of trucks. One of my trucks is also a CCExx2F3xxxxx VIN (but the date portion of the blue sticker is ripped off and I don't have a build sheet, so I haven't added it to the list)...But both the blue sticker and the SPID have matching VINs with the F3 sequence on my Chevy truck.

There were I think 603,347 Chevy trucks (Blazers, C10s, K20, suburban, etc) produced in 1972 (according to post #6 in this thread...I added up all the 1972 production numbers). It appears Flint produced close to half of those 600,000 Chevy trucks based on the serial number referenced. In other words, Flint produced the 255-thousandth Chevy truck in March of 1972, and production likely went into June or July.

Re: The build date project
 

Added today’s, I started adding post numbers to the entries. I will go thru and update the rest of the entries as I get time. I still need to add a pm list I’ve got, hopefully tomorrow.

Re: The build date project
 

Piecing together post #7 in this thread states that his 1970 Blazer s/n would be 0S138946 with build date of 12/69.

On a related note, both of the first two posts in this current thread mention that Blazers and Jimmy's don't follow the same truck sequence. I see that many (all?) 69 blazers started with a "B," but are there any more details regarding that sequence comment? I would think the last 6 s/n digits are chronological (per plant), regardless if Blazer, suburban, or truck. No?

Re: The build date project
 

I certainly do not doubt the veracity of the "F3", I just have not been able to find the pattern. Considering Flint producing 300,000 for 72 equals 25,000 per month. So going to the end of March should equal about 200,000 trucks. So going with those numbers, the highest VIN for March of 72 Flint should be F300000. Of course, these numbers are based upon averages, not faster and slower production at different times.

Looking at March numbers for the other plants, Flints numbers would have to be about 71% higher. But if Flint produced half of the entire 72 run, this percentage would make sense.

However, we do have a Flint jamb sticker 4/72 with a sequence of F163780. I have added the F355033 and will continue to try and reconcile this.

Re: The build date project
 

Another curiosity... Has anyone seen a 2F2 VIN? Did they jump from F1 to F3 for some reason?

Re: The build date project
 

The lower number is after the higher number, so that alone does not explain. I'm sure the the folks on this forum, we will figure it out.

Canadian trucks?

Re: The build date project
 

71 chevy; 1S622914; 1/71

71 GMC; S132048; 6/xx....based on our data, it should be 6/71

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Ok, I think I found the information but am looking at it more deeply and will share when I find more. It appears for 1972 Flint also used sequencing beginning with 300001 and 700001. For 71 Flint also used 800001.

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From web
Z154606 = 4/9/70

Re: The build date project
 

72 chevy; 2F332776; 12/71
71 chevy suburban; 1F647787; 5/71
72 chevy suburban; 2F160080; 3/72
70 gmc St Louis; SZ55672; 10/69

Re: The build date project
 

My 69 C/20 parts truck 9S436384; 7/69 she was from St. Louis

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72 chevy; 2Z154193; 3/24/72

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Not sure this one is helpful. Can anyone read it?

72 Blazer; 2S105697; I think the date is 8/71, but maybe this is one for the discard pile since it is hard to read.

Re: The build date project
 

Ill add it and show ??/71

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That’s exactly what I was gonna say, hopefully other vins will fill in around it and solve the mystery.

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My 72 C10:
2A150583
3/72

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72 chevy; 2F368889; most likely 5/72
70 chevy; 0Z167860; 6/70

Re: The build date project
 

The first Baltimore (and non-Fremont) build sheet I've seen...

72 chevy; 2B151900; 4/11/72

And a 70 chevy; 0J106770; 10/69

And a 67 chevy; 7Z155862; 5/18/67

And a 68 GMC; ZB18911; 3/25/68

Re: The build date project
 

Nice work! Now, where was the Baltimore build sheet found in the truck. No reason (other than there is a B in my VIN:).

Re: The build date project
 

This one evidently had two build sheets.

72 chevy; 2Z128188; 12/10/71...or at least 12/1x/71

First build sheet shown attached in this post. See following post for 2nd build sheet.

Re: The build date project
 

2nd build sheet for same truck in post 115.

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1972 2z118425 11-71

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1970 0a116484 12/69
1970 0s120860 10/69

Re: The build date project
 

I'll add my 2 cents...

I think the blazers and suburbans should be mixed in with the other serial numbers (and maybe noted in parentheses as you have been doing). It appears to me that every model was mixed together as it came down the assembly line. Any proof otherwise?

You guys are doing a great job compiling and laying out the info, but I'm going to nitpick a little (it's the engineer in me):
-Fremont is spelled with only one "e."
-Under each year and make, I think we should keep the list sorted purely by serial number, not by date. ie. Don't intermix 2F1 with 2F3. Sorting by serial number I think will make it easier to look up our build dates in the future when our list is bigger.

Regardless, I'll be looking for more data points to add!

Re: The build date project
 

I can look into those things, no problem. Geunther and myself elected to continue to add the blazer/suburban’s for now to see how it all plays out. If the need arises in the future we will address it then. I will look into the 2F1vs2f3, I agree it might make things easier especially as more trucks come in. With as much leg work as you’re doing you deserve the right to nitpick:lol: