Can Somone Identify My Two Frames?

[Clavo106]

I had two frame with Questions and concerns. both are Sub posts to be 1/2 ton frames. 1970 closest to me and furthest is 1971 (in photo). in my 1970 frame at some time it got 3/4 ton suspension. the frame matches the vin. and the cab mount are in location for 1/2 ton. now the past owner was driving truck with out springs. the shock where the only support for a un given amount of time. the frame and the axle tubes did not look damaged but the vary back where the spare tire mount and back looks bad, i believe very heavy loads.on the bumper (the truck came with helper bags)I was going to cut and replace the back portion.
Now 1971 I bought for my concerns. got it at the wrecking yard .I believe its a 1/2 ton. the vin read 1/2 ton. its exactly the same accept it did not come with a steering links, p/s box and axle when I bought it /.the owner kept the cab with the fender read c/10... now someone cut it I believe at one point? but the cab mount are way lower and welded on (like it would be in location on the 3/4 ton) there not even straight up little off. the cab look straight at the yard with cab bed and fenders? now on not Shure what the back side of the frame is. (The White spray paint is what on confused on) I don't c that brace gong to trail arm member to the frame. on any other c10 or c20 frame? and the D/shaft support bearing mount not Shure if that correct it looks homemade.
Im right now in the process of doing LB to SB conversion on both.. not Shure what frame to keep because one just a parts truck. im thinking repair my 1970with matching vin even though I have to change suspensions around and fix the back frame / but I need to cut 8" off the back any ways and a few more to fix the area on the rails.
Let me know anything u mite notice any advice works. thanks.

[Clavo106]

1970 frame.

[Clavo106]

1971 frame

[Clavo106]

1970 frame

[Clavo106]

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[kehstr]

if the vin on the frames say that they were originally 1/2 tons, then they are, someone just changed the suspension parts out at one point in time.

P.S. i need a driveline for my project, would you sell one of yours?

[Xeen]

The 3/4 ton has extensive double plating that covers a large portion of the rear section of the frame where as the 1/2 ton has a very small section of double plating.
Since you didn't post any pictures of the rear section of the frame I cannot assist you in identifying which model frames you have.

[Clavo106]

KEHSTR_ I'm not a member to be selling items in the Forum...wish I could help u out but there are plenty of good folks on the for sell thread that can help u out. also try wrecking yards and CL.
XEEN_ I BELIVE i got what u meant by rear frame double plating ,on the 1971 1/2 ton front 3/4 ton rear going by the cab mounts and now by "frame double plating".. im looking at the holes in frame for the shock support member/ i believe that's correct..
Still a little confused in the brace and driveline support "painted in white" for STOCK. . its not a big issue now. just would like to know what i have that's all..thanks

[Clavo106]

[Xeen]

You will notice that there is "L shaped" steel plate on the inside of the frame rail that only covers the face and bottom that is located just under the rear suspension crossmember where the upper shock mount is located that only extends approximately 6 inches out from each side on a 1/2 ton, however on the 3/4 ton it extends much further which strengthens the frame to make heavier bed loads and towing possible.
Both the 1/2 ton and 3/4 ton have the same "plate" on the bottom exterior of the frame, that is the spring mounting plate.

[Clavo106]

Originally Posted by Xeen

You will notice that there is "L shaped" double plating on the inside of the frame rail that only covers the inside and bottom of the rail just under the rear suspension crossmember where the upper shock mount is located that only extends approximately 6 inches out from each side on a 1/2 ton, however on the 3/4 ton it extends much further which strengthens the frame to make heavier bed loads and towing possible.
Both the 1/2 ton and 3/4 ton have the same "plate" on the bottom exterior of the frame, that is the spring mounting plate.

Got it loud in clear sir _THANKS ALOT!

[Xeen]

I'm glad I could help clarify that for you, most people don't know the differences between the 1/2 ton and 3/4 ton frame simply because they haven't had a need to know, but it is useful information for sure because now you know how GM turned a 1/2 ton frame into a 3/4 ton frame.