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#1 |
Registered User
Join Date: Apr 2019
Location: Bloomington IL
Posts: 4
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RPO codes
Ok so I know the rpo/option codes on the inside of the glovebox. The question comes when there are handwritten rpo codes on the upper part of the firewall that match what drivetrain is in the truck (1971 C10). RPO says its a 350 with a 400 behind it and the writing says ls9 and m38, and off to the left I am guessing is the order number? Just had me curious and I figured I would ask yall. Oh and long time reader first time posting.
Thanks, Joey |
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#2 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: RPO codes
LS9 is a 4 barrel truck 350 and M38 was the RPO code for an automatic transmission.
I thought a 1971 C10 would have had a TH350(?) edit, I guess you're asking about the other numbers? order number would my guess too
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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#3 |
I'm trying....
![]() Join Date: Oct 2013
Location: Athens, GA
Posts: 2,629
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Re: RPO codes
Solid first post.
Pics of the firewall and SPID would be helpful if you are suggesting that there is a discrepancy between the what the firewall says and what the SPID says. It sounds like you know, but JIC here is a list of the RPO codes for reference: http://outintheshop.com/options.html I would generally expect that M38 would be a TH350 and what you'd expect in a 1/2T truck. But my limited understanding is they may have played a little fast and loose with the auto RPO codes. M49 is listed for both TH350 and TH400 with specifics called out in the SPID. The passenger side of the firewall is usually reserved for the model number of the truck. For instance CE10934 would be a 2wd V8 1/2T LWB fleet side. Here some links to threads about factory markings: http://67-72chevytrucks.com/vboard/s...d.php?t=591402 http://67-72chevytrucks.com/vboard/s...d.php?t=431775 http://67-72chevytrucks.com/vboard/s...d.php?t=694023 http://67-72chevytrucks.com/vboard/s...d.php?t=674971
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1970 K20 Z62 https://67-72chevytrucks.com/vboard/...56#post9334756 1970 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=645076 1969 K10 SWB CST http://67-72chevytrucks.com/vboard/s...52#post8520352 1971 K20 Z84 https://67-72chevytrucks.com/vboard/...90#post9047290 1946 B.F. Avery Model A Tractor http://67-72chevytrucks.com/vboard/s...55#post8292555 "Sometimes I wonder if zander208 was even real..." |
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#4 |
Registered User
Join Date: Apr 2019
Location: Bloomington IL
Posts: 4
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Re: RPO codes
Soon as I get a chance to get some pictures put up somewhere to link to the passenger side is marked ce10904, whichbmakes sense as model number which matches spid and drivers side has the ls9/m38 even though the glovebox tag matches vin and other equipment it lists trans as m49edit though I've read the m49 was supposedly a 400. I got this truck in pieces, not quite basketcase but literally frame sitting outdoors since early 80s and everything else apart in a garage. It's been like a big boy puzzle. It's the first 70s model I've done and already had a 67/68 front clip with it so I was way ahead of the looks curve. I've done square body a bunch and now this and have a 50 gmc showing up this week to go along qith my 50 b1 dodge lol and the 87 r10 and 85 k5 Jimmy
Last edited by Paintmycar2; 06-11-2019 at 06:54 PM. |
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#5 |
Registered User
Join Date: Apr 2019
Location: Bloomington IL
Posts: 4
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Re: RPO codes
![]() ![]() https://www.dropbox.com/s/6oc8ujoicm...45048.jpg?dl=0 https://www.dropbox.com/s/nw1cxvit8e...45103.jpg?dl=0 Let's see if that works if the images dont show maybe the links will work. |
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#6 |
I'm trying....
![]() Join Date: Oct 2013
Location: Athens, GA
Posts: 2,629
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Re: RPO codes
Is it a factory high hump cab? 1/2T 2WD 350 engine, my expectation would be that it came from the factory with a TH350 transmission. In that case, I see the M38 on the firewall and the M49 in the cab to be virtually interchangeable and mean the same thing...that being that it left the factory with a 350/TH350 combo. Unless you've got other evidence to the contrary.
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1970 K20 Z62 https://67-72chevytrucks.com/vboard/...56#post9334756 1970 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=645076 1969 K10 SWB CST http://67-72chevytrucks.com/vboard/s...52#post8520352 1971 K20 Z84 https://67-72chevytrucks.com/vboard/...90#post9047290 1946 B.F. Avery Model A Tractor http://67-72chevytrucks.com/vboard/s...55#post8292555 "Sometimes I wonder if zander208 was even real..." |
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#7 |
Registered User
Join Date: Apr 2019
Location: Bloomington IL
Posts: 4
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Re: RPO codes
That's cool then, I hate the green but since i had all the original stuff and it was a solid truck i couldn't bring myself to change it
Thx for the info I'm sure i will have more questions when i get down to the nitty gritty of things if i cant find it in a thread already. Thanks again. |
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#8 |
Registered User
Join Date: Feb 2016
Location: Trenton,Ontario & South Carolina
Posts: 755
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Re: RPO codes
Some of the numbers on the firewall,are scheduling numbers,when the cab went down the line,they would have the scedule number on it from the build sheet,and if there was a specific option that was needed to be drilled out or somthing installed, it would let the line worker that this was the option,I remember seeing these on vehicles when I worked on the line at GM.
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