4bt is (to my knowledge) the most popular diesel swap
3.3 is the industrial engine, right (like generators, loaders, etc)... less common, but I seem to recall at least one on the forum posting about that swap
heck, with enough fabrication (and time, skill and money) you could also put in a 6bt, but that is a bit of a stretch on what can be done... there are only a small handful (one recently here) who have done a 6
Sean B. - Schenectady, NY - 95 YJ, 350/700r4/NP241, JB Shorty SYE, 8.8 rear, 2" BDS, 1" homebrew shackles, Daystar 1" BL, TJ flares, 35x12.50 General Grabber AT2 on 15x10 Bart D-Truckers, Polyshield polycarbonate windshield, HD over/under crossover steering
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