Just bought a 3.0 92 pickup, it runs great for now. However, I'm trying to figure out what the best diesel engine swap is. More power would be great but I'm mainly looking for reliability and gas mileage.

 

Engine swaps are notorious less reliable than an engineered system.

You could always try converting to a 3lt if you can get one imported.

 

The 3.4 swap is by far the easiest and most reliable swap you can do to your 3.0. Plenty of extra power over the 3.0 and a little better mileage as well. Aside from swapping the ECU and some wiring it's literally a bolt in swap, no modifications required aside from exhaust. There's plenty of good 4 cyl diesel engines out there, but you might be a little disappointed with the power.

 

How about the new jeep diesel?

 

T700D turbine

7 stage compressor, P3 air is breaking sound barrier as it enters hot section. No liquid coolant system (P3 air does cooling).

a few tech issues to workout. Turns @ 20,000rpms constant. Just the wonders of gear reduction or hydraulic drive. Roughly 12% efficient. Power output is limited to current metallurgy available. takes a turbine to start a turbine.

would be badass and you could be the legend that does the swap that everyone talks about. Do a solid write up.

FYI... my response makes about as much sense as your post.