I put a small Isuzu turbo diesel into a Datsun 1 ton pick up about 20 years ago. It still gets used a bit on the farm. Like the Benz diesels, its high revving & so no diff change was necessary.
We also have a Ford F750 tray (22') truck with a perkins 6354, in the place of the old 351 V8. It is great for transporting cattle & hay. Never gives trouble, gets an oil change & filters once in a blue moon, fires up first time even if its been sitting for a year.
I would like to do a diesel conversion on a unimog but the diffs are too low ratio & I dont think you could swap out the crown wheels & pinions with MB car ones.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving