Frame differences?

[bmchevy1979]

I have a friend with a 70 c20 and he wants to convert it to 4x4 but it's very hard to find a 67-72 chevy 4wd frame for a fair price.
What I want to know is are the frames between a 70 c20 and a 76 k20 similar enough I can rob the spring hangers off this frame and put them on his?
I know they are different wheelbase but the frames look very similar to the squarebody truck frames I'm familiar with.

[Mts67C10K20]

I am in process of installing a set of 76 3/4 ton axles under my 67 k20
The differences I have found so far are with the spring perches on the corp 14 needing to be moved inboard for a narrower frame and the shock mounts moved to match the 67
That my 2 cent

[demian5]

Originally Posted by Mts67C10K20

I am in process of installing a set of 76 3/4 ton axles under my 67 k20
The differences I have found so far are with the spring perches on the corp 14 needing to be moved inboard for a narrower frame and the shock mounts moved to match the 67
That my 2 cent

How about the hangers on a 2WD frame? Can they be added?

[Mts67C10K20]

Crawled under and this is what I came up w
This is a comparison of my c10 to my K20 frames
Both are 28" at the front spring mount and 34" at the rear
In the front 2 rivets need to be removed and holes reused to mount the spring bracket
First pic
For the rear mount of the front spring some reshaping of the side of the frame rail needs to be done to flatten it
Pic 2&3 k20
Pic 4 c10
I now you are using a c20 frame but should be similar
Hope this helps

[Jeff's bowtie's]

Originally Posted by Mts67C10K20

Crawled under and this is what I came up w
This is a comparison of my c10 to my K20 frames
Both are 28" at the front spring mount and 34" at the rear
In the front 2 rivets need to be removed and holes reused to mount the spring bracket
First pic
For the rear mount of the front spring some reshaping of the side of the frame rail needs to be done to flatten it
Pic 2&3 k20
Pic 4 c10
I now you are using a c20 frame but should be similar
Hope this helps

This is how I did the frame for the rear shackle
Cut the dimpled area out

[Jeff's bowtie's]

Welded in a solid plate same thickness

[Jeff's bowtie's]

Ground it smooth and measured for the holes and cut the larger one with a holesaw

[Jeff's bowtie's]

And for added strength I welded the side plate of the donor frame

[Jeff's bowtie's]

I think let turned out very well

[Mts67C10K20]

Nice job
And your last pic answered another question I had
Thanks

[bmchevy1979]

Thank you guys for the measurements I'll take a few off of my 76 frame and see if I can use it's hangers and do the swap it looks like I will be able to from the pics you posted

[bonestock72]

You can drop the earlier cab right on to the later model chassis. The front cab mounts line right up as do the mounts for the front sheet metal. You will have to shim of course. The chassis are the same width so you can make the early model work on the late model for the rear cab mounts. The bed mounts you will be flying blind. This works for 60-66 as well