Red tags on frame?

[Badgerslayer]

Hello!
First post here, hope i dont get it in the completly wrong section.
Friend of mine in the progress of restoring his -89 silverado, on his frame somewhere under the doors there was one hole on each side where these red plastic clips were inserted. Marked WB, anyone know what they are for? Some ID-tags for plant workers to use correct parts?

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[df2x4]

Some ID-tags for plant workers to use correct parts?

I believe that is the case, although I'm not sure on the details. I think @Z71Hobbs may know more.

EDIT - I do know that there are several different tag combinations, both letter code and color.

 

[GMCTruck]

I always wondered about those tags. My 95 GMC K1500 has SHD tags. I assumed that meant Super Heavy Duty.....ha ha.

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[Danny CainOBS]

My 89 has the same “WB” tag as well

 

[Anubis]

You beat me to asking this question but I think the answer is likely quite simple. Perhaps somebody with insider information could shed more light. The tags are likely a GM engineering level for your specific frame design. Engineering changes and updates were constantly being made within GM so they needed a robust way to label the EC level. There were also different frame designs for each model. Cueing up the wrong frame on the assembly line would be a showstopper.

 

[Anubis]

My 89 has the same “WB” tag as well

That’s the bugs bunny edition.

 

[89obsSB]

Hello!
First post here, hope i dont get it in the completly wrong section.
Friend of mine in the progress of restoring his -89 silverado, on his frame somewhere under the doors there was one hole on each side where these red plastic clips were inserted. Marked WB, anyone know what they are for? Some ID-tags for plant workers to use correct parts?

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My 89 rcsb I’m restoring had the same thing on it.

 

[454cid]

I'd guess the tags are the Broadcast Code..... easy/quick identification for in-plant use, rather than a long part number.

 

[Caman96]

Super Fast&Furious!

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[PlayingWithTBI]

Now you guys are ALMOST talking me into crawling under my truck to look - maybe someday