I have a 99 f-250 super duty longbed 4x4 with the two half doors on the cab ( not sure if that's called crew cab or what ) my frame is rusted to an extent the truck isn't safe to drive. My question is , what other years will work for a frame swap ? Thanks.

 

99 to 2004 is a direct swap
2005 to 2010 body will swap over but you'll have coil sprung front suspension and differnt motor/trans. 05 up is a big deal for suspension swaps on the 99-04 trucks....some think the ride is better

 

The 05 up coil bring front is worth it for the shorter turning radius.
As said 99-04 is direct swap
05 up you'll need the suspension and steering to go with the frame.

 

Your truck is called a Super Cab.