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#1244632 11/25/2017 8:08 PM
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I just picked up a '51 1/2 ton and am a little confused. Instead of a 6 lug pattern, it has 8. Can anyone point me to a thread that explains this or can help? The serial number is 9JPB 5851, so it's definitely a 1/2 ton. Cheers!
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Last edited by bigBob; 11/30/2017 9:49 PM.
bigBob #1244635 11/25/2017 8:50 PM
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Cruising in the Passing Lane
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the explanation is you have a truck that's had 65 years of various folks messing with it, including switching titles and vin tags ....

8 lugs is a 3/4T - check the WB, 116" = 1/2, 125" = 3/4

Bill



Moved over to the Passing Lane

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bigBob #1244647 11/25/2017 11:50 PM
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'Bolter
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I had an old timer tell me he had the same thing, he claimed it was a "heavy half" that was special ordered for the highway Dept.

bigBob #1244655 11/26/2017 12:23 AM
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'Bolter
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None of the data books nor salesman books make any mention of this option. GMC yes, Chevrolet no. The heavy 1/2 GMC I bought at auction a few years ago, the model 100. You will notice it has 6-lug wheels.
https://www.flickr.com/photos/advance-design_parts_co/8130539722/in/album-72157631870734114/
https://www.flickr.com/photos/advance-design_parts_co/8130511175/in/album-72157631870734114/

bigBob #1244666 11/26/2017 1:59 AM
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The plot thickens...I just measured the wheel base, center-to-center, and it's 116". Nothing seems hacked up or hodgepodge. It looks like a factory 1/2 ton with 8 lug wheels and 5 windows. Any thoughts??

bigBob #1244667 11/26/2017 2:07 AM
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Bolter
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At some point a PO replaced the front and rear axles with 3/4 ton. Done in order to make a short bed 3/4 ton since the factory didn’t make one.🛠


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bigBob #1244717 11/26/2017 11:45 PM
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Renaissance Man
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Does it have a torque tube?
Does it have a u-joint ball with a short stub like a 3/4 ton setup?
Is it possible to put 3/4 ton 8 lug hubs on a half ton front axle?


1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
52Carl #1245037 11/28/2017 11:13 PM
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It has a torque tube. I see no u-joints. Anyone have a suggestions about sharing photos? I'm eager to know what this creature is.

bigBob #1245040 11/28/2017 11:28 PM
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Bubba - Curmudgeon
Bubba - Curmudgeon
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There was no standard GM-issued "heavy half" as you describe.

Anything is possible?

Here are 1951 truck specs - you have probably seen these?

For the heck of it, see if you can ID you transmission and rear end - there might be date codes cast/pressed into them?

bigBob #1245308 11/30/2017 9:53 PM
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I added a few photos, for reference.


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