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Old 05-11-2019, 12:48 PM   #1
Pops C-10
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Suffix Code mystery

Hello all,

Have a very original low mileage '69 C-10 that was a fairly late build in that it was delivered on 8/7/69 with an engine assembly of 06/24. What I've not seen before is the suffix code, which "U5."

Anyone ever come across this before?

Thanks
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Old 05-11-2019, 03:40 PM   #2
geezer#99
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Re: Suffix Code mystery

Post a pic of the pad.
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Old 05-11-2019, 09:10 PM   #3
Pops C-10
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Re: Suffix Code mystery

Here are a couple of the pad...undoubtedly a "5" and original stamping with discernible broach marks.
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Old 05-11-2019, 09:35 PM   #4
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Re: Suffix Code mystery

Might be a miss stamp.
I’ve seen that before.
LMC shows ‘u’ suffixes for 69 on a 307.
What’s the casting number?

http://www.lmctruck.com/icatalog/cb/full.aspx?Page=10
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Old 05-11-2019, 09:39 PM   #5
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Re: Suffix Code mystery

Also what transmission?
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Old 05-11-2019, 10:08 PM   #6
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Re: Suffix Code mystery

I'm goin with UB: 69 307 2bbl manual trans (clearly a 5 as I'm lookin at it, but perhaps a mis-stamp, or the "B" was broken that day (i.e. I'm with Geezer!))
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Old 05-11-2019, 10:31 PM   #7
Pops C-10
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Red face Re: Suffix Code mystery

Motor is a 307...block casting # 3970020. Manual transmission.

Kinda of thought "UB" would be correct for it also, but had been wondering if there was some secret casting I didn't know about

Probably right about the "B" being broken that day...either that or the engine stamper had broken glasses
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Old 05-11-2019, 10:42 PM   #8
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Re: Suffix Code mystery

He was likely blind in one eye and couldn’t see out of the other!

BTW welcome to the jungle!
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Old 05-12-2019, 01:06 PM   #9
Pops C-10
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Thumbs up Re: Suffix Code mystery

geezer#99

Thanks for the welcome!
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Old 05-12-2019, 01:12 PM   #10
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Re: Suffix Code mystery

You got pics of this truck?
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Old 05-12-2019, 05:42 PM   #11
Pops C-10
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Re: Suffix Code mystery

Here are a couple pics.
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Old 05-12-2019, 05:56 PM   #12
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Re: Suffix Code mystery

Nice!
Clean too!
Thanx for the pics!
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Old 05-12-2019, 07:58 PM   #13
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Re: Suffix Code mystery

Great looking truck! Thanks for posting pics.
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Old 05-12-2019, 08:20 PM   #14
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Re: Suffix Code mystery

Very nice truck. I'm not all that far from you I live near the Rondout reservoir. But I am down in Wappingers falls regularly have a rental house there and a couple of my cars are in the detached garage.
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Old 05-12-2019, 09:01 PM   #15
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Re: Suffix Code mystery

Such a nice looking truck! SPID pic in our future?
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Old 05-13-2019, 04:57 AM   #16
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Re: Suffix Code mystery

"U5" is the COPO motor... Nice score, welcome to the mayhem...
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Old 05-13-2019, 10:07 AM   #17
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Re: Suffix Code mystery

WOW ! What a sweet looking truck.
Hope you plan on keeping her just the way she is.
Thanks for the pictures.
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Old 05-14-2019, 07:49 AM   #18
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Re: Suffix Code mystery

Very very nice truck. I like it as a good example of "all the in between" you could get. There were the plain Jane utilitarian trucks to all the bells and whistles CSTs. Then there were those custom tailored for what would be important to an owner and what they had no need for. Some were customer ordered, others were a dealership's idea of what they perceived their market demanded, or to offer variation in sticker price to up sell those hesitant to go all out. Mid level trim and comfort, V8, chrome appearance items, and that's it. It also shows not all truck buyers were convinced an automatic, p/s, and p/b.
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'67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi..........'The 67' (project)
'72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok...'The 72' (rolling)
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Last edited by special-K; 06-17-2019 at 07:59 AM.
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Old 06-16-2019, 09:29 PM   #19
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Re: Suffix Code mystery

Where did you find the copo suffix? I've got a 68 with the same u5# clear as day.
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Old 06-17-2019, 08:01 AM   #20
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Re: Suffix Code mystery

I think he was joking. This makes it more interesting with two trucks having this code. Thanks for bringing it back.

How does GM replacement engine ID work? As in new vehicle warranty replacement.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC

'67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi..........'The 67' (project)
'72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok...'The 72' (rolling)
Tim

"Don't call me a redneck. I'm a rough cut country gentleman"

R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586
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Old 06-17-2019, 11:39 AM   #21
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Re: Suffix Code mystery

I know there was a couple of othe guys with the U5 CLEARLY stamped. It does seem like a mystery #, but im pretty sure it didn't happen that many times..lol I did see something about being a buick engine and with the blue/green paint, it makes me scratch my head! It is just an old c30, so a transplant is very possible.
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