history: 1999 F-250 Lariat Super Duty, 2WD, 7.3L, 6-speed manual tranny, extended cab, 8 ft bed, 147K miles - purchased w 45k miles apr 2015.
situation: family is currently Hubby, wifey, 4YO boy. wifey due in DEC! extended cab isn't enough room for 2 kids.

i'd like to keep my low mileage motor, my manual 6-speed tranny, and my full 8 ft bed (basically because i'm having to replace her vehicle too and cant afford 2 new vehicles, AND I like my truck!). I'm pretty sure a crew cab body will not fit my existing chassis and still let me keep my bed (but i'm coming down to the wire and may sacrifice). i need a crew cab long bed diesel body only. then I swap: enging, tranny, dash, GEM. if it's a gasoline chassis, I also swap tank and fuel lines.

OK guys, is this even doable? if it is, anybody know of anything available? I do have a line on a 2007 gasoline body and chassis with a blown motor for 2k. How possible is that swap? I realize this is a completely huge project. but i'm trying to keep what I like, get what I need, and do it all for as cheap as I can...

Any help or "sound" advice, technical or mechanical (not family planning), is appreciated.... thanks

 

Anything is possible with enough time, money and energy. Usually one of these three will fall out.

 

Here is a thread on extending a truck that you might find useful.
https://www.ford-trucks.com/forums/1...4wd-build.html