Anyone else have a 67 K25 with 10000lb GVW?

[RedRoad]

Ive loved this truck since the first day I saw it. Was described as an error and did not make it a factory 1 ton rated 4 wheel drive truck.

https://67-72chevytrucks.com/vboard/...d.php?t=657077

[RedRoad]

I posted up the images of that truck on a FB page and a 2nd 10000GVW GMC K25 showed up!!!

First VIN
KM2590V PC1920B

Second VIN
KM2590V PC191..

One a definite Timpco fire truck and the second just happens to be red as well.

Are these the only surviving 10000lb GVW factory four wheel drive GMCs in existence?

[special-K]

I love that truck, too. I don't think I've even seen one. In Maryland we can register a 3/4t up to 10,000# no matter what the factory GVW is.

The factory GVW on a single wheel 1t is under 10k#. I don't know why you had to buy a C3500 pickup with NAPCO conversion to have a 1t 4wd, that didn't have a 10,000# GVW, if you could just order a K2500 with 10,000# GVW.

We are talking GMC K2500s when we are talking 67-72. GM went to just K25 later on in the Square bodies.

[68panelman]

More pics needed, especially front axle.

[RedRoad]

Pics of the gold one are in the thread above. I guess I can repost them here to make it easier.

[RedRoad]

more pics

[RedRoad]

Clinton Bays is the owner of the 2nd 10000 GVW GMC K20. Says to have the HD front axle, and LW code Eaton rear axle. 16.5x9.75 on all four corners. Currently going under full restoration

[68panelman]

Thanks, I went to the link. I was hoping for pics of the red one.

[RedRoad]

Originally Posted by 68panelman

Thanks, I went to the link. I was hoping for pics of the red one.

The owner said he would get more pics of his truck but its currently in pieces. I will post them here as soon as they are available.

[68panelman]

Cool. Always curious with the rare oddballs, especially 4WD.
Thanks

[57taskforce]

I’ve never seen those overloads on a 67-72 4x4 before. I’ve seen similar on square bodies before but not the 67-72. Very interesting thread.

[special-K]

It's definitely got some springs. My guess is back then GM and the fire apparatus companies worked together on some special arrangements. The commercial end of COPO. Making available what ever is needed that is not offered off the production line. Same as CUCV builds. They are their own line.

I helped on a '68 Chevy Stepside C/30 NAPCO restoration that was a brush fire truck.

[StingRay]

Wow my C30 dually grain truck is only 10k gvw. As a 69 at or beyond 10K brakes are the obvious weak point. I believe they are the same front brakes as the 3/4 ton. Suspension wise at 14000 it hardly know the weight is there. Just rides nice.

[RedRoad]

Here is one more of the red one

[RedRoad]

Here are a few more of the red truck and a little history.

Originally Posted by Clinton Bays

Sadly my truck lost the spid from previous owner..it was under the seat. Mine was a tanker from P.A. then sold in 1976 to a farmer who used it as a sprayer for his field for a few years. ...then it was sold to the owner before me with no bed, and he went to restore it and ran into health problems and now I own her. . The 305 has a beautiful lower end and no ridge on the cylinder walls, but scarred terribly down the cylinders from overheating.

[special-K]

Being a '67 GMC it may haver never had a SPID. Ok, now I see him say it was under the seat, so he means build sheet. That thing was clean!

[Bob B.]

Eaton rear axle, is it an H-072? Standard rear axle for a KM 2500 is a Spicer 60, no other RPO rear axle listed. Weird duck for sure!

[special-K]

^^^ The Eaton rear went over my head. It hadn't sunken in that these are both GMCs until I looked back to check when posting about the SPID. These are cool trucks to have found. If there weren't two with the same 'different' features this would not be so fascinating. I though glitch on the VIN-plate/upfit when I saw the one first. A lot is upfit but the factory was also in on these special builds

[68panelman]

Thanks for posting more pictures. That truck does look nice and clean

[Ironangel]

The Timpco has a Dana 60 knuckle front, the red truck has the later king pin Dana 60 front. Dana's axle charts for GM only go back to 77 and according to BillaVista.com GM never used the Dana 60 front with the closed knuckle design, only the spring loaded king pin type. So now I'm really confused! I think Tim is correct in that these were COPO one off ordered trucks. The GM and Dodge Dana 60 fronts were almost identical with the differences noted in BillaVista.com http://www.billavista.com/tech/Artic...nt_Axle_Bible/

[MJN]

Originally Posted by Ironangel

The Timpco has a Dana 60 knuckle front, the red truck has the later king pin Dana 60 front. Dana's axle charts for GM only go back to 77 and according to BillaVista.com GM never used the Dana 60 front with the closed knuckle design, only the spring loaded king pin type. So now I'm really confused! I think Tim is correct in that these were COPO one off ordered trucks. The GM and Dodge Dana 60 fronts were almost identical with the differences noted in BillaVista.com http://www.billavista.com/tech/Artic...nt_Axle_Bible/

Neither of these trucks has a Dana 60 front axle. They're both Dana 44.

[Ironangel]

Originally Posted by MJN

Neither of these trucks has a Dana 60 front axle. They're both Dana 44.

, I'm not disputing that, but without getting into a pizzing contest, please tell me how you know they are 44's vs the 60's? I assumed they were 60's because of the 1 ton 10,000 pound ratings. Without looking at the casting number on the center section or the BOM number how can you visually tell one from the other? I mean without measuring u-joints or tube diameters? Again, i'm not saying your wrong, I'm asking you to explain to me why I am wrong...Were the axles noted on the SPID?...
Thanks! It's becoming more difficult to recall what I cant remember and then suddenly remembering what I never knew...

[MJN]

Originally Posted by Ironangel

, I'm not disputing that, but without getting into a pizzing contest, please tell me how you know they are 44's vs the 60's? I assumed they were 60's because of the 1 ton 10,000 pound ratings. Without looking at the casting number on the center section or the BOM number how can you visually tell one from the other? I mean without measuring u-joints or tube diameters? Again, i'm not saying your wrong, I'm asking you to explain to me why I am wrong...Were the axles noted on the SPID?...
Thanks! It's becoming more difficult to recall what I cant remember and then suddenly remembering what I never knew...

Special-K stated the biggest visual difference with a 60 using one u-bolt and two cap screws on the passenger side. Also, in the red truck you can see the axle has ball joints and not king pins as a 60 uses, the kingpin will have a grease cap held on with 4 cap screws and a grease fitting in the center. The lockout hubs are also a Dana 44 giveaway.
I found this thread with some photos of a closed knuckle Dana 44 as well. http://67-72chevytrucks.com/vboard/s...d.php?t=661660

[Dieselwrencher]

Originally Posted by Ironangel

, I'm not disputing that, but without getting into a pizzing contest, please tell me how you know they are 44's vs the 60's? I assumed they were 60's because of the 1 ton 10,000 pound ratings. Without looking at the casting number on the center section or the BOM number how can you visually tell one from the other? I mean without measuring u-joints or tube diameters? Again, i'm not saying your wrong, I'm asking you to explain to me why I am wrong...Were the axles noted on the SPID?...
Thanks! It's becoming more difficult to recall what I cant remember and then suddenly remembering what I never knew...

Here's more food for thought. Chevy never used a D60F until 1978 in a K30. Plus, the axle of choice for a Napco, Howe, or even Marmon Herrington 4x4 conversion was an Eaton front. So, if these odd trucks were to have any other axle besides a D44 which was the only one they offered, I'd bet it to be an Eaton front. If it was the HO72 variant, you would have had your GVW handled too. Especially with 17.5 or larger rim size tires.

[68panelman]

Ironangel, I'm thinking it's a regular ol Dana 44 ^^
The 60 would have the inner u-bolt stud mount cast into the diff housing