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Old 08-05-2018, 06:32 PM   #1
rollin thunder
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Builders tag. Does anyone know these codes?

I lost the builders tag or builders sheet or whatever it is called. Below is the only picture I can find that is readable. the truck is a 1984 c10 1/2 ton 2WD 3 speed on the column and originally had the 250.

I can figure out the first two lines on the second column. I assume it says fleetside and 4.1 250L6. Does anyone know what the other lines are? or could be? maybe there is a cheat sheet so to speak to tell me what they mean.


In case this inst readable I wrote out everything on a sheet of paper. I will post it next
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Old 08-05-2018, 06:43 PM   #2
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Re: Builders tag. Does anyone know these codes?

here is what is visible from the picture.
If you just know what options that would show in those lines would be great as well!
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Old 08-05-2018, 07:33 PM   #3
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Re: Builders tag. Does anyone know these codes?

Quote:
Originally Posted by rollin thunder View Post
here is what is visible from the picture.
If you just know what options that would show in those lines would be great as well!
Disregard the "1" that they all start with:

E63 = Pickup Box - Fleetside
LE3 = Engine - L6/250 - 2 BBL - Varajet
NA6= High Altitude Performance Emissions System
XYP= ?
ZYP= ?
Z53= Gauge Package - Voltmeter, Oil Pressure & Coolant Temp
77W= Interior trim combination - Dark Maple (W)
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Old 08-05-2018, 09:07 PM   #4
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Re: Builders tag. Does anyone know these codes?

Nice thank you! The interior color of dark maple is interesting. I wasn’t aware that was an option. I figured it was burgundy. That’s what most replacement parts look closest to it.

For the xyp and zyp lines do you know what type of option is usually listed their? Like brake systems or rear end gear ratio?
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Old 08-05-2018, 10:06 PM   #5
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Re: Builders tag. Does anyone know these codes?

Xyp and zyp are probably the tire size front and rear mine are 225/75r15and listed as xlx and zlx with ylx as the spare in a 225/75r15. Gq1 is probably a 2.73 rear

Last edited by wileecoyote427; 08-05-2018 at 10:13 PM.
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Old 08-05-2018, 10:30 PM   #6
rollin thunder
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Re: Builders tag. Does anyone know these codes?

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Originally Posted by wileecoyote427 View Post
Xyp and zyp are probably the tire size front and rear mine are 225/75r15and listed as xlx and zlx with ylx as the spare in a 225/75r15. Gq1 is probably a 2.73 rear
That would make sense on the tire size. Thanks!
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Old 08-05-2018, 10:33 PM   #7
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Re: Builders tag. Does anyone know these codes?

Here’s a big list of rpo codes.
You might find what you need in there.

https://www.marshu.com/images-websit...-car-codes.pdf

Your original tire size could have been 195 75 15’s. My old 84 had that size originally.
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Old 08-05-2018, 10:50 PM   #8
rollin thunder
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Re: Builders tag. Does anyone know these codes?

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Originally Posted by geezer#99 View Post
Here’s a big list of rpo codes.
You might find what you need in there.

https://www.marshu.com/images-websit...-car-codes.pdf

Your original tire size could have been 195 75 15’s. My old 84 had that size originally.
That’s a good list. It doesn’t show 195/75r15 but it also doesn’t have those rpo codes. coyote’s Theory of rear and front tire size seems to hold water because the sequence of the rpo codes they do have match with front and rear tire size.

But I wonder what the standard rear end gear ratio was. In this list the rpo for a 2.73 is GS1 among several others but GQ1 is the only standard ratio line it seems. And it doesn’t actually give a ratio. If 2.73 was standard why bother giving it several othe rpo codes?
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1964 Chevy C10 short bed
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Old 08-06-2018, 12:26 AM   #9
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Re: Builders tag. Does anyone know these codes?

X, Y, Z prefix are mounting positions.
YP suffix is 195/75R16 radial tires

XYP is 195/75R15 Front
YYP is 195/75R15 Rear
ZYP is 195/75R15 Spare

GM was fairly consistent about these RPO codes...

My 2005 2500HD came with LT245/75R16 Load Range E tires on PY0 Aluminum wheels and a steel spare.
XGK-TIRE FRONT LT245/75R16/E BL R/PE ST OOR(9591214) TIRE(XGK)
YGK-TIRE REAR LT245/75R16/E BL R/PE ST OOR(9591214) TIRE(YGK)
ZHH-TIRE SPARE LT245/75R16/E BL R/PE ST ALS(9591207) SPARE TIRE(ZHH)
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1986 M1008 CUCV
2000 GMC C2500, TD6.5L, NV4500
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Old 08-06-2018, 11:35 AM   #10
Keith Seymore
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Re: Builders tag. Does anyone know these codes?

Quote:
Originally Posted by rollin thunder View Post
That’s a good list. It doesn’t show 195/75r15 but it also doesn’t have those rpo codes. coyote’s Theory of rear and front tire size seems to hold water because the sequence of the rpo codes they do have match with front and rear tire size.
The tire theory is absolutely correct. It is set up so that a buyer could order different tires on the rear of the vehicle than on the front.

Quote:
Originally Posted by rollin thunder
But I wonder what the standard rear end gear ratio was. In this list the rpo for a 2.73 is GS1 among several others but GQ1 is the only standard ratio line it seems. And it doesn’t actually give a ratio. If 2.73 was standard why bother giving it several othe rpo codes?
Because the standard ratio changes based on the other powertrain items and GVW rating.

The optional ratio noun name is reported because it always stays the same (ie, GU6 = 3.42; GT4 = 3.73).

https://www.gmheritagecenter.com/doc...olet-Truck.pdf

The standard axle ratio for your configuration was 2.73:1

K
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Old 08-06-2018, 11:43 AM   #11
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Re: Builders tag. Does anyone know these codes?

It's called a SPID label (Service Parts ID label).

If you would like to have a new one made you can contact site member Jeff (chipflyer) and he will make you an authentic looking one.

K
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Old 08-06-2018, 12:37 PM   #12
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Re: Builders tag. Does anyone know these codes?

Quote:
Originally Posted by Keith Seymore View Post
It's called a SPID label (Service Parts ID label).

If you would like to have a new one made you can contact site member Jeff (chipflyer) and he will make you an authentic looking one.

K
Nice! Thank you! I may talk to him when I get to putting final touches on the truck.
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1964 Chevy C10 short bed
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Old 08-06-2018, 12:44 PM   #13
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Re: Builders tag. Does anyone know these codes?

Isn't it kind of odd for an 84 to have the SPID on the inner fender?
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Old 08-06-2018, 12:50 PM   #14
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Re: Builders tag. Does anyone know these codes?

My 84 GMC K1500 has it on the driver’s side inner fender also
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Old 08-06-2018, 12:53 PM   #15
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Re: Builders tag. Does anyone know these codes?

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Originally Posted by 44th Miss Inf View Post
My 84 GMC K1500 has it on the driver’s side inner fender also
Interesting. I thought they moved it to the glove box in the late 70's. I guess I learned something new today. Thanks
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Old 08-06-2018, 11:40 PM   #16
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Re: Builders tag. Does anyone know these codes?

I've seen them in either location on the same Model Year trucks. I figured it was assembly plant dependent. Keith may have more insight on it...
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1959 M35A2 LDT465-1D
1967 Dodge W200 B383, NP420/NP201
1969 Dodge Polara 500 B383, A833
1972 Ford F250 FE390, NP435/NP205
1976 Chevy K20, 6.5L, NV4500/NP208
1986 M1008 CUCV
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8


RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
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Old 08-07-2018, 04:51 AM   #17
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Re: Builders tag. Does anyone know these codes?

I always enjoy seeing this kind of information being sleuthed out. hatzie, Keith, thanks.
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Old 08-07-2018, 11:54 AM   #18
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Re: Builders tag. Does anyone know these codes?

Quote:
Originally Posted by hatzie View Post
I've seen them in either location on the same Model Year trucks. I figured it was assembly plant dependent. Keith may have more insight on it...
Correct – there is some variation based on final assembly location.

K
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