Depends on how you want it set up and what is still good on ur wag.
1. If the frame has seen better days I'd say find a rolled dodge truck w the cumins turbo diesel and if you get really lucky the NV45000 manual trany. If you have access to a torch you can cut and splice the frame to fit but if not find one with a similar wheelbase.
2. dredge up the parts and fab some custom motor mounts for ither a 4 or 6bt. If you tow heavy loads or have 40's or something like that i'd use the 6 but if you just commute you could get away with the 4.
3. Try using a gm (as long as you don't have it screaming under a load all the time they are reliable) but I think you will need at least an adapter if not a another tranny.
4. Or if you so choose you can use a (shudder) ford diesel whatever.
I list these in the oder I would do them. Being a heavy equipment Tech. I tend not to trust the fords because I always see them to be in the work shop at regular intervals for things like engine fires and major internal breakages. How you split every piston in half in 6 months of driving... Sorry getting off topic.
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Ford 6.9/7.3 NA motors are cheap, plentiful, and very reliable. The V8 platform also keeps engine length down, helping engine bay fitment.
Just remember front spring upgrades are in the works as well, since Diesels are substantially heavier than their gas counterparts.
Speakin of this, does anyone have a parts list for swapin a 6.2/6.5 GM diesel into a Waggy? Its gonna be my next build.
I don't blame people for their mistakes, but I do expect they pay for them.
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I am looking to switch my 1987 Grand Wagoneer over to a diesel engine. I know that some of you have done the conversion yourself and I was wondering if you could offer any helpful hints!
I just swapped my 1996 Suburban to a 6bt Cummins diesel. It was fairly straightforward, I put conversion mounts in, the Dodge radiator and intercooler (which took a lot of cutting of the core support), wiring, brackets, transmission adapter, etc, etc.
The easiest swap in terms of modification would be a non-intercooled 4bt. This would fit fairly easily front to back but might have some clearance around your differential (a lift would help). Most early 4bt's are a one wire hookup to make them run.
6.2/6.5 diesel would also be an easy swap that has been done and would make plenty of power for an FSJ.
You can google 4bt Grand Wagoneer and come up with lots of videos and forum posts, those people would be able to help out a lot.