Only guy I've ever know of that did it successfully (pictures are long gone):
http://www.gmfullsize.com/forum/showthread.php?t=64681&highlight=3/4+ton+ifs+swap
You'll have to dig through the thread for info. Its the typical one guy actually doing it and a dozen sh¡t flies buzzing around with bullsh¡t comments and questions.
That truck was sold long ago so no further info is available than that thread. Even the pics are gone LPPoff his personal web site. Was in contact with him once upon a time and got lots of info and advice.
Lots of people have barked about doing it, some have claimed to "Frankenstein" it, very few have done it and even fewer have done it right. The amount of people who have carried through on their claims can be counted on one hand (or less).
I thought about doing it to a 1500 before but abandoned it after some pondering and aforementioned info from the guy who did it.
There are no "mounts" to strip out of the frame. It is the frame itself. You have to chop and hack on the diff case. You need to lop the top mount off and install an aftermarket bracket for starters. Then there's the CV axles to deal with. Then the live spindles. Then the suspension. Then the...well, you be the idea.
Lots a work. More trouble than its worth IMHO. Especially if you're doing it because its what you have lying around and you need the truck running. You'll end up with more down time than you wanted for sure. Just find a standard 8.25 center section and bolt it in. They're cheap (relatively) and they're everywhere.
And once its done, you still only have a FM 9?25 its in there. About the only real plus is you can buy a locker for it. And then you're putting more stress on it it if you wheel it. Which pretty much puts you right back in 8.25 territory (in strength) anyways...
Your rear axle is a 10.5 full floater. Full boat 2500 axle. Also used in the 3500. Swaps right over with new axle u bolts.
At the end of the day, do as you wish. But its not a straight transfer and requires more fabrication than most are capable of. When I say capable of, I mean doing it right.
Anyone can kludge parts together, but it just ends up being a mess and usually weaker than what they started with. Or worse case, just damned unsafe for themselves and everyone around them.
Good luck.
P.S. the 92 6.5 has the mechanical db2 pump and the standalone 4l80E TCM. Simplest and most desirable of the GM 6.x diesels. Also the most reliable of the breed. Except for paint and small things, the one in your pics looks in pretty good shape or at least easily salvageable. I suppose it would be easier if some arse hadn't peppered it with bullet holes in the front. If it runs, I'd consider just get it spiffed up and drive that.
