Greetings,

If you have a small Jimmy (based on the S-15 platform) then you won't get a
6.5L diesel into the engine bay.  The turbo hangs off the passenger side and
there's just not enough room for all the mechanicals and plumbing.  Not to
mention that the smaller trucks don't have the front suspension capacity for
this motor, which is roughly the weight of a big-block and is made of cast
iron.

However, if you have a full-sized Jimmy (based on the full-sized pick-up)
then you can do it.  This model Jimmy eventually came with the 6.5L diesel
as an option.  I suggest that if you're going to do a swap, purchase an
older pick-up with the motor you want and do a direct swap of everything you
need from one to the other, putting the motor from your current truck into
the donor and then selling it to help recoup some costs.  If you choose to
use a '94 or later 6.5L diesel, then you will have to swap over the
electronics for the throttle as well.  This motor had a "drive-by-wire"
throttle and not a simple cable from the accelerator to the fuel injection
pump.  Of course you could go back to the all-mechanical DB2 fuel injection
pump from the earlier diesels instead of the current DS4, but that's just
all the more work.  I hope that you are friendly with some good diesel
mechanics at that point.

Of course if you are looking for a "simple and easy" then maybe someone here
could direct you to one of the last years of 350 diesels that supposedly
weren't too bad.  Just don't expect much in the power department.

Cheers - Jonathan