I did mine on the frame and it wasn't a problem for most of the welds but it would be easier off the frame . As Michael said, use lots of braces if you're doing it off the frame. Once you start cutting the floor and rockers out there is no strength to the cab. Without good bracing everything will twist and you'll be looking for a replacement cab.


Dave
66 GMC- father /son project with the "GMC KID"
36 Chevy PU- 4x4 lifetime project
64 Skylark- wife says its hers