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Old 03-27-2018, 10:31 PM   #1
7 Devils
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Serial # confusion

So after trying to study the internet for information on my 55 370 2 ton, I've got more questions than I started with.
My serial number is 371 R Y2843 as found in the cab of the truck.
I'm assuming it's a 370 series, but booklets and this is also indicate it's a "6400". The ID plate shows 18,000 GVWR. It has a 270 I6, and a two speed dually rear end.

Anyone willing to help to help a newbie out on what this truck is? (Please).

Also, does anyone else have a schematic that covers frame dimensions for this truck that they'd be willing to share?

Thanks in advance

3/28/18

So after more time spent trying to hunt down the info, I am left with dimensional and model info from Chevy data of the same year. I really don't know if they directly cross over. They Chevy data suggests a 6403 Chassis but the GVWR #s are off and my door tag clearly says 18,000lb, not 19,500.
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06 GMC Sierra crew cab Z71 DD leveling kit, 34's, bumper, LED lighting. Still doing stuff to it.
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55 GMC 371 2 1/2 ton. Upcoming project.

Last edited by 7 Devils; 03-28-2018 at 11:48 AM. Reason: Update
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Old 03-29-2018, 07:43 AM   #2
buggy5872
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Re: Serial # confusion

Look on this site. http://www.oldgmctrucks.com/page0009.html if you do not find the info email Rob and he will get it for you.
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Old 03-29-2018, 10:38 AM   #3
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Re: Serial # confusion

Quote:
Originally Posted by buggy5872 View Post
Look on this site. http://www.oldgmctrucks.com/page0009.html if you do not find the info email Rob and he will get it for you.
Thanks for the info. I'll give that a shot.

Dan
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Forgive my typos, big fingers and little Android digital keyboard....what a mess
06 GMC Sierra crew cab Z71 DD leveling kit, 34's, bumper, LED lighting. Still doing stuff to it.
67 El Camino Custom 300 Deluxe. In progress.
55 GMC 371 2 1/2 ton. Upcoming project.
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