I seem to be the only one posting in other vehicle discussions as of late. Its hard to say but I'll just say it. My brother in law bought a 67 mustang :poke: he needs to replace the floor pans. As some of you may know that they were built as a half framed car. So the motor sets on a mount and the rear axle sits on a frame but just in front of where the front seats sit and to where the trunk pan starts there is no frame. How in the world do you replace a pan that is structural? :dontknow: I could fab up a jig and hold the frame rails in place but even if I warp the pan a little then the car wont ride right. Even at that you have structure built into the pan itself to support the car, therefore if I am right I could not just go in there with a piece of sheet metal and weld it in. I just need some ideas on how to do this because with a fully framed car you don't have to worry about it shifting or supporting anything when you put in a pan. Thanks

check out youtube im sure theres a video in the but theres more supporting the body then just the floor pan you have the roof which is lik 80% of the support i will also do some research and let you know what i find

Seems like I've seen some pretty major cut & weld floor pan repairs on some of the shows on Speed channel, like chop, cut, rebuild. They often weld in cross supports inside the interior to hold things together while they make repairs, then the cross supports are removed once the replacement parts are in place.

I had a Fox body mustang and it had subframe connectors welded into place between the rear subframe and the front subframe. Apparently the Fox body mustangs were easy to torque the body if too much power was put into the car without subframe connectors.

Good luck, 67 Mustangs are cool - :yell:

Do a google search- there is a ton of DIY articles on this very subject. here's just one of them
http://www.mustangmonthly.com/howto/mump_0411_how_to_replace_floorpans/viewall.html

Early Mustangs are OK They were not built as good as later models. Kind of a cheap, light weight body design. My neighbor is doing a '66, and has it on a rotisserie that he built. He has it rebuilt with many new sheet metal parts, and doing a really nice job on it. It' gonna be a nice one.....
I almost bought a new one in '66, with a high-perf engine, four-speed, etc, but bought a new Pontiac Tempest Sprint instead, with the OHC six.
That car was a piece of junk, with parts falling off, heater puking on the floor twice etc, all in one year...

The rocker panel provides most of the strength through that section, especially the inside vertical piece.