I'm building a hydraulic tilt-deck treework truck.
Base rig is heavily rusted F250 extended cab 7.3/ZF5 long box, PTO output.
Looking to extend the wheelbase to accommodate a ~10' flatbed, so I'm inclined to acquire a crewcab 4wd frame, and build my own rear cab mounts, & swap my drivetrain & ext cab.
I've got a kingpin Dana 60 and duallie Dana 70 to go beneath.

Do you guys know what year of frame would be best? I have a line on a 1989 frame for $200, just not familiar with any differences.

 

They offered cab and chassis trucks that hads frames just for this. As well as thr F superduty.

Not sire on the specific differences, but I'm pretty sure the frame was just a tad thicker and boxed. The sheet metal between all the trucks was the same, so there can't be too many differences.

 

4wd cab chassis frames were offered?

 

Yes.........

 

4wd cab chassis frames are pretty rare iirc. I extended my f250's frame. Added several feet of c channel to the rear of the frame behind the rear axle. It now has a 6x10 flatbed.

 

I would be looking for a 161" wheel base F350 or F-superduty cab-n-chassis to splice to your supercab frame.
Ford never made a super or crewcab cab-n-chassis trucks. Anything you may have seen is a conversion.

I am looking to do the same thing to my 95 F-superduty to put a supercab on

 

Brad is correct that Ford never made a Super or Crew Cab 4x4 F350 Cab-n-Chassis vehicle. they only came in Regular cab. They will have Body/Chassis/Model Code F38 in the VIN.