SWB = 115"
LWB = 127"
To properly cut down a long bed to a short bed box you remove 12" from the front and 8" from the rear. So with what you're asking, if you threw a shortbed on your truck right now it would look like this (pic borrowed from hewittca's build thread):
I'm in the middle of cutting one down. My truck is already a shortbed, but I wanted an OEM bed and this longbed from AZ was damn near perfect.
