I have a chassis cab that currently has a dump bed on it, I don’t need the dump bed anymore so I was wondering if I would be able to swap a regular dually bed on it and that it will line up correctly. Thank you

 

The frame on the Cab and chassis is longer then a standard long box frame. You end up with a 12" or so gap between the box and cab.

 

It depends on how long the chassis is. There were several lengths. Chassis cabs were made to be custom built. You'll have to measure how long your bed is. I think you would have better luck with a flat bed. Since you have a dump bed now, you can get flat beds that will dump in case you ever need to use it as a dump truck again.