With a Torch, a sawsall and both a stick and a MIG welder you can basically do anything
having the cab off lets you repair the inevetible body mount rust and install new body mount bushings.
a frame you can take apart, likeake the spring buckets off of?
Is one you can inspect in detail.
a frame with a known condition is better than one you don't know...
I already knew my frame was "ok" behind the passenger side spring bucket
(THE big worry on TIB/TTB RBV frames)
But Like I said getting another frame and doing all the prep work to it first
(mounting fuel tanks, axles etc) then simply moving the engine and trans, then the cab over is fairly straight forward and much easier than you'd think.
My brother and I moved a "loaded" F-series supercab frame from the trailer
we brought it home on and onto the "roller frame" it was being installed on
with two heavy duty ratchet straps a couple of 16' long doubled up 2x6's
for it to slide on.
By comparison swapping a '93 explorer crossmember into my '87 supercab was easy.
It literally took me all of an hour to remove the 2wd crossmember and I could have done it faster if I had bothered to remove the 2wd beams before I started.
It took ~45min of grinding to prep the frame for the new crossmember.
I used a 5'length of 3/4" threaded rod to spread the frame rails to slip
the crossmember in.
then I had to wait for my buddy to show up with his welder
(The carb was fubar on the 14hp Kohler engine that powers my stick welder)
with the engine already out removing and replacing the engine crossmember
actually only took about 6 hours before the frame was ready for me to start
bolting stuff back on.
BTW, I specifically used a Gen2/3 style crossmember.because I prefered the more accessable brake line routing of the later crossmember
The early crossmember runs the brake line to the passenger side INSIDE the crossmember and that makes it a Royal PITA to work on or replace.
Of course I won't need to because I made my own hardlines of stainless steel
The big question on his diesel is does he want a Solid axle or a TTB?
Frankly I prefer the TTB because I could actually put bigger brakes on it.
I'm also not a fan of the wheel bearing setup on the most common Dana 30,
the XJ (cherokee) front axle...
the hidden thing with a Solid axle swap is the fabrication required to create mounts and links, to connect the steering linkage...
Often it's more than someone wants to get into in a "sink or swim" situation.
The EASIEST way would definatly be to get a Gen1 or Gen2 4x4 frame and
move his stuff onto it.
Yes the pieces that must be moved are bigger and heavier than those man people are used to moving, but it doesn't require an engineering degree to create pieces that are correctly dimensioned AND CRASH WORTHY like fabricating your own suspension links in an SAS conversion.
AD