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I started with an 03 f750 with air brakes and a 6 speed. It has a cummins and had a 20' box on the back.

I didn't take a pic when I first got the truck so I'm using street legal's pic of his. Mine looked identical to this:

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First I got the cab off and put both the crew cab and regular cab side by side to transfer parts. I bought the crew cab and it was brand new still on the crate from Ford.....never mounted to a truck. The guy said he bought it 8 years ago and just never did use it.

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Now the work begins. I had to cut off the front structure of the crew cab to prep for the flip nose of the f-750. I could've clipped the cab and it woulda been a lot easier, but I decided to just change out the firewall since it is different and cut off the front structure

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This stiffner plate needs transferred to the crew cab as well as a few other brackets I will show later

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Part of this plate needs cut off as well. Here is a comparison between the two

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Now time to change the firewall out. Here are the tools I used to do that. A spot weld cutter from harbor freight and an air chisel.

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Mocked up and ready to weld the F750 firewall into the crew cab:

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Firewall welded in and primered:

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Ready for paint outline:

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Outlined:

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Next I cut out the six speed shifter hole:

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This piece needs trimmed off. It's for fender mounts on smaller pickup trucks

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Mounting cab in progress:

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