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Old 10-10-2019, 12:32 PM
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1969 c10

Bought a 1969 c10 it’s on a later model frame is there anyway to find out what year the frame is , last owner didn’t know

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Old 10-10-2019, 06:03 PM
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The engine that's in it, did it come with the body or with the frame?
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Old 10-10-2019, 07:02 PM
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67-72 frames were essentially the same, and used coil springs and 12-bolt differentials on the C10. 73-87 frames were quite a bit different and used leaf springs and 8.5" 10-bolt differentials on the C10.

Another difference: The 67-72 transmission cross members were level, whereas the 73-87s were higher on one side, making dual exhausts kind of a pain to install.

One more: 67-72 upper and lower control arms did NOT use bushings, whereas you should be able to plainly see bushings on 73-87 truck frames.
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Old 10-10-2019, 07:49 PM
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Quote:
Originally Posted by 55_327 View Post
67-72 frames were essentially the same, and used coil springs and 12-bolt differentials on the C10. 73-87 frames were quite a bit different and used leaf springs and 8.5" 10-bolt differentials on the C10.

Another difference: The 67-72 transmission cross members were level, whereas the 73-87s were higher on one side, making dual exhausts kind of a pain to install.

One more: 67-72 upper and lower control arms did NOT use bushings, whereas you should be able to plainly see bushings on 73-87 truck frames.
The 73-87 Trucks didn't use the 8.5" 10-bolt in the rear until either 1981 or 1982 time frame....all of the 1973-1980 still had a 12-bolt Truck rear.
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Old 10-10-2019, 08:43 PM
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And the 67-72’s had leafs or coils.
Manual trans frames had a saddle crossmember that the bellhousing bolted to.

Also check rear shock mounts.
Staggered in front and back of rearend on 73 up. Both In front of rearend on 67-72

Last edited by RWENUTS; 10-10-2019 at 08:53 PM.
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Old 10-11-2019, 01:00 PM
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Thanks for everyone’s replies should be able to figure it out from here
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Old 10-11-2019, 01:30 PM
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Thank you for ignoring me Dave. Not a good way to start new on a forum. I had a reason for asking.
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Old 10-11-2019, 05:57 PM
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Sorry tech inspector didn’t mean to ignore you don’t get on the website a lot,as to your question really don’t know if it’s original or not the gentleman I bought it from didn’t know
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Old 10-11-2019, 09:49 PM
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If you want to dig into your motors origin you can find some pics and charts in here to determine that.

https://www.mortec.com/

And to further the search if you look for a flat pad in front of the passenger side head, the info there will possibly give you a suffix code that is in the list in here.

Chevy VIN, Trim Tag and Drivetrain Information & Decoding
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Old 10-12-2019, 05:07 AM
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If its a 73-87 GM squarebody truck frame it will also have the VIN number stamped in a couple of locations. The most likely is on top of the passenger side frame rail, but its often stamped so far back that its under the cab. Once you find the VIN you should be able to cross-reference to a year and model.

Another option is to look at the GM truck frame reference spec sheets and compare dimensions. https://www.gmsquarebody.com/ has the information you need.

Bruce
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Old 10-12-2019, 08:36 AM
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Another tell-tale on the frame is the post 72 has the brake proportioning valve located on the crossmember below the rad.
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Old 10-12-2019, 09:53 AM
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Posting a couple of pictures of the frame in the engine area and a shot or two under the truck might help the guys here to judge better.
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