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Old 09-29-2012, 11:19 PM   #1
USMC45
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Numbers at the top of firewall?

Anybody know what these are, my truck has them on both sides and I've seen other trucks on here with the same thing.

Junkyard, factory, any ideas?

Here's some pics, looks like a sharpy?




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Old 09-29-2012, 11:50 PM   #2
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Re: Numbers at the top of firewall?

they are factory assy line markings

ce10934 should match your spid's model number - i.e. longbed 1/2 ton fleetside. Is your truck a gmc (the T, perhaps?)

unsure about the stuff on the right, maybe others can chime in
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Old 09-29-2012, 11:53 PM   #3
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Re: Numbers at the top of firewall?

Chevrolet
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Old 09-29-2012, 11:58 PM   #4
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Re: Numbers at the top of firewall?

Quote:
Originally Posted by jocko View Post
they are factory assy line markings

ce10934 should match your spid's model number - i.e. longbed 1/2 ton fleetside. Is your truck a gmc (the T, perhaps?)

unsure about the stuff on the right, maybe others can chime in

Hmmm, I think you may be right. My MIN is CE10934. Here are my full specs.

68 C10 CST Spec's

Vin CE148S207402
W/ Base 127
SE (Blank)
Model Identification Number
CE10934
Engine Code V0426TCK

Vin Breakdown
C - Conventional
E - 8 Cylinder
1 - 3,900-5,800 1/2 Ton
4 - Pickup
8 - 1968
S - St. Louis
207402 - Vehicle Number

Model ID Number Breakdown
C - Conventional
E - 8 Cylinder
1 - 3,900-5,800 1/2 Ton
09 - 54"-59" Cowl to Axel Dim.
34 - Cab & Fleetside Pickup Box

Engine Code Breakdown
V - Flint (Engine)
04 - Month
26 - Day
TCK - 1973 - 307

Option # - Option
45?7AD -LT Blue/ Off - White
4N40VC - Power Steering
4A11CA - Tinted Glass
4618AD - Blue Vinyl Trim
4U63HG - Push Button Radio
4Z53GP - Ammeter - Oil Gauge
4C60DL - Air Cond - All Weath
4L30AC - 327 Cu In V-8 Eng
4B93AA - Door Hedge Guards
4Z84RL - Custom Sport Truck
4G80AA - Positract Axel 373R
4P01AA - Wheel Covers
4B98AB - Side Trim Mold Eq
4J70BD - Brake Booster Eq
4M49DG - Turbo Hydra - Matic
4H05AB - Rear Axel 373 Ratio
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Old 09-30-2012, 12:13 AM   #5
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Re: Numbers at the top of firewall?

The writing on the right side (in the pic, but would actually be the left side of the truck) that says AC30 M49 is the engine and transmission codes, 327 automatic.
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Old 09-30-2012, 12:28 AM   #6
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Re: Numbers at the top of firewall?

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The writing on the right side (in the pic, but would actually be the left side of the truck) that says AC30 M49 is the engine and transmission codes, 327 automatic.
Yup ok makes sense, I do see that. 30AC=327 & M49=Turbo Hydramatic.

I'll have to check the other numbers tomorrow, they are kind of hard to read in the picture. Good to know, I was worried that maybe it got totaled and salvaged maybe, but all the numbers in the glove box, door seal, and frame all match, the frame is straight and drives like a dream. That's a relief off of my shoulders!
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Old 09-30-2012, 12:54 AM   #7
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Re: Numbers at the top of firewall?

Well here is what I can offer. The only thing left are the "T"s repeated on both ends of the firewall, I just don't remeber right now where my reference for this is.

Your extended paint SPID callout is 4537AD and all you need is the 537 code denoting the Light Blue and Ivory two-tone paint
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Old 09-30-2012, 01:05 AM   #8
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Re: Numbers at the top of firewall?

Better?
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Old 09-30-2012, 01:14 AM   #9
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Re: Numbers at the top of firewall?

Thank you SSTim, that looks like the complete breakdown of it expcept the T's. That picture with the outlines really help!
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Old 09-30-2012, 01:37 AM   #10
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Re: Numbers at the top of firewall?

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The only thing left are the "T"s repeated on both ends of the firewall, I just don't remeber right now where my reference for this is.
I've never heard a definite answer as to what they were. I always thought they denoted 2 tone paint, and the ones that said 4T were deluxe 2 tone, (4 tone? example, white, blue, white, blue), but again not positive.
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Old 09-30-2012, 01:39 AM   #11
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Re: Numbers at the top of firewall?

No problem glad to be of help.
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Old 09-30-2012, 10:56 AM   #12
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Re: Numbers at the top of firewall?

under the ac flapper, this is actually 4T for an AC truck. Not sure what is to the left of that. I have seen an S on non ac trucks.

Also, behind the distributor, there may be a number from 1-1000. This is the production job number and you may find this on the lower cross member below the radiator, on the back of the speedo cluster and on the brake pedal assembly.
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Old 09-30-2012, 12:14 PM   #13
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Re: Numbers at the top of firewall?

The numbers on my 72 were almost unreadable. Matched the SPID and build sheet. The job number was also etched into the fire wall above the brake booster. May be hard to see in picture.
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Old 09-30-2012, 03:25 PM   #14
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Re: Numbers at the top of firewall?

Interesting thought on the "T" and "S" being A/C option status. That may very well be so. But I don't agree that in this case the far right set is something other than "Z84" (CST RPO#). This three character group is a common run and size with the next character "T" being a larger size and at a greater angle relative to level. The "T" is however very similar to the model number that follows is a progressive downhill run. To me this indicates the markings were written as seperate, distinct groups. If you have other clear examples of a "4T" grouping in this location without the CST option or other potential option number overlap I'd like to see it. At this point it would appear that "T" alone could indicate A/C, especially as it is repeated on both ends of the firewall.
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Old 09-30-2012, 04:46 PM   #15
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Re: Numbers at the top of firewall?

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Originally Posted by John H. View Post
Also, behind the distributor, there may be a number from 1-1000. This is the production job number and you may find this on the lower cross member below the radiator, on the back of the speedo cluster and on the brake pedal assembly.
Your right, there is actually a 6 up there, it's kinda hard to see with the seal sticking up, but I removed it to clean.


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Old 09-30-2012, 05:00 PM   #16
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Re: Numbers at the top of firewall?

Fun to put back on the truck when your all said and done. I scrubbed half of mine off before i knew what i was doing. I some what figured it out and put them back on the fresh paint.
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Old 09-30-2012, 08:48 PM   #17
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Re: Numbers at the top of firewall?

I think the T is for the trim. T alone, one trim strip; T with 2, upper and lower.

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Old 09-30-2012, 11:22 PM   #18
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Re: Numbers at the top of firewall?

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I think the T is for the trim. T alone, one trim strip; T with 2, upper and lower.

http://67-72chevytrucks.com/vboard/s...5&postcount=41
What is upper & lower trim?
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Old 09-30-2012, 11:40 PM   #19
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Re: Numbers at the top of firewall?

The trim pieces that run along the sides of your truck...

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Old 09-30-2012, 11:47 PM   #20
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Re: Numbers at the top of firewall?

I guess the CST Bowtie10 are the upper and the side molding the lower?
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Old 09-30-2012, 11:50 PM   #21
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Re: Numbers at the top of firewall?

Now that I think about it the T2 is probly the two tone ones with the upper & lower trim like you said, and mine is T for the single.
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Old 10-01-2012, 12:42 AM   #22
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Re: Numbers at the top of firewall?

Quote:
Originally Posted by SS Tim View Post
Well here is what I can offer. The only thing left are the "T"s repeated on both ends of the firewall, I just don't remeber right now where my reference for this is.

Your extended paint SPID callout is 4537AD and all you need is the 537 code denoting the Light Blue and Ivory two-tone paint
Thats really great, nicely done!
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Old 10-01-2012, 01:11 AM   #23
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Re: Numbers at the top of firewall?

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Thats really great, nicely done!
Thanks, I try to help.
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Old 10-01-2012, 05:53 AM   #24
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Re: Numbers at the top of firewall?

Looks awesome, thanks mate.

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Old 02-18-2013, 12:17 AM   #25
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Re: Numbers at the top of firewall?

Good info here!
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