getting ready to start a frame swap on a 58....

[55dude]

Originally Posted by marc55

This is how I did mine. 78 chevy frame rear spring were moved 4" forward. I wanted my cab as close to the frame as possible. The rear of the cab was set on bushings right on the frame. I then leveled the cab and measured how much of a body lift I needed for the front of the cab. Used 1 1/4 square tube.
Then I mounted the fenders and measured again how much of a lift I needed for the core support. They came straight up off the frame. For the bed I channeled the bed rails over the frame. I am running 2 1/2 suspension lift with 35s. The front should come down about 2" when I put the engine in it.

Attachment 1273552

Attachment 1273570

looks like those will work!

[homealone]

Looking forward to seeing your build.

I have a similar idea in mind. I plan on swapping my 55 onto an 85 1-ton corporate dually. From my initial measurements, basing everything off the front axle centerline, the core support, as well as the front and rear cab mounts are basically in the same position lengthwise on both frames. The body mount widths, however, are different.

Both frames are the same width, so I plan on removing both cabs and cab mounts. Bolt the 55 mounts back on the 55 cab and lower it over the 85 frame. From the looks of it, it should sit right in position. Hopefully the core support will fall into place as well.

As for the bed, I will probably lose some floor depth since I want the body as low on the frame as possible.

Something like this.