Help with frame stamp ID - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mike80D · 12-29-2021, 09:22 PM

Truck is a 5/25-31 Flint built 72. It has 5-11-20 stamped on the side of the frame near the driver’s door area. The 20 is really throwing me for a loop. We’re frames built off location and that’s a plant code perhaps??

**BigBird05** · 12-30-2021, 06:03 PM

To the best of my knowledge there were 2 frame venders for GM. One was A.O. Smith I can remember the other one.

**71CHEVYSHORTBED402** · 12-31-2021, 02:30 AM

Pic of similar for a 1971 C10, SWB & leaf springs. I don't know what the numbers mean less the part number. For what worth most of the stamped parts on the truck are April 1971, the truck was built May 1971, Fremont. 4-23 seems to imply April 23, but 26 is the same mystery as yours.

Know what 670 on your frame means?

Mike80D · 12-31-2021, 07:50 AM

Quote:

Originally Posted by 71CHEVYSHORTBED402

Pic of similar for a 1971 C10, SWB & leaf springs. I don't know what the numbers mean less the part number. For what worth most of the stamped parts on the truck are April 1971, the truck was built May 1971, Fremont. 4-23 seems to imply April 23, but 26 is the same mystery as yours.

Know what 670 on your frame means?

I'm not sure what the 670 means. Thanks for your reply.

**BigBird05** · 12-31-2021, 12:09 PM

Here are the #'s from my 72 frame, LH rail A41772 B005, RH rail A4672 B906. Probably adding more confusion than helping.

**71CHEVYSHORTBED402** · 01-03-2022, 11:49 PM

Just guessing the 670 in the OP is a call-out or whatever term and means for example this one is 4x4, coils and so forth. It's what makes trucks special

20 might be the factory number, for instance. I remember working for a franchise and the numbers weren't in numerical order. I wonder how many factory's built these? Figure GM pumped out approx. 9K trucks some months just Fremont alone, that's a lot of frames.

I looked on the web for 70s GM frame stamp and casting, everything close just turned up this website and still empty.

**MJN** · 01-04-2022, 11:05 AM

This link has some better information on how to breakdown the frame stampings- given its focused on Chevelles but since AO Smith was one of the major frame suppliers the codes may carry over.
http://chevellestuff.net/qd/frames.htm

Tomchev · 01-04-2022, 12:35 PM

Went by AO Smith building in Milwaukee years ago and there were car frames stacked as high as the fence around the building.

12-29-2021, 09:22 PM	#1
Mike80D Registered User Join Date: Jul 2021 Location: Crab Orchard KY Posts: 283	Help with frame stamp ID Truck is a 5/25-31 Flint built 72. It has 5-11-20 stamped on the side of the frame near the driver’s door area. The 20 is really throwing me for a loop. We’re frames built off location and that’s a plant code perhaps?? Attached Images

12-30-2021, 06:03 PM	#2
BigBird05 Senior Member Join Date: Aug 2019 Location: Cheraw Posts: 1,305	Re: Help with frame stamp ID To the best of my knowledge there were 2 frame venders for GM. One was A.O. Smith I can remember the other one.

12-31-2021, 02:30 AM	#3
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,188	Re: Help with frame stamp ID Pic of similar for a 1971 C10, SWB & leaf springs. I don't know what the numbers mean less the part number. For what worth most of the stamped parts on the truck are April 1971, the truck was built May 1971, Fremont. 4-23 seems to imply April 23, but 26 is the same mystery as yours. Know what 670 on your frame means? Attached Images __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025

12-31-2021, 12:09 PM	#5
BigBird05 Senior Member Join Date: Aug 2019 Location: Cheraw Posts: 1,305	Re: Help with frame stamp ID Here are the #'s from my 72 frame, LH rail A41772 B005, RH rail A4672 B906. Probably adding more confusion than helping.

01-03-2022, 11:49 PM	#6
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,188	Re: Help with frame stamp ID Just guessing the 670 in the OP is a call-out or whatever term and means for example this one is 4x4, coils and so forth. It's what makes trucks special 20 might be the factory number, for instance. I remember working for a franchise and the numbers weren't in numerical order. I wonder how many factory's built these? Figure GM pumped out approx. 9K trucks some months just Fremont alone, that's a lot of frames. I looked on the web for 70s GM frame stamp and casting, everything close just turned up this website and still empty. __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025

01-04-2022, 11:05 AM	#7
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 2,985	Re: Help with frame stamp ID This link has some better information on how to breakdown the frame stampings- given its focused on Chevelles but since AO Smith was one of the major frame suppliers the codes may carry over. http://chevellestuff.net/qd/frames.htm __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com

01-04-2022, 12:35 PM	#8
Tomchev Registered User Join Date: Jan 2016 Location: Forest City NC Posts: 30	Re: Help with frame stamp ID Went by AO Smith building in Milwaukee years ago and there were car frames stacked as high as the fence around the building.



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