I couldn't find any power/torque curves for the VW 1.9L TDI engine, but based on stats below, I'd think you'd have to push it pretty hard to move a 2-ton FJ40 around. Would rock in a Samurai.
Toyota Engines
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"B" 2.9L, 21:1 compression, 4cyl diesel
80hp@3600, 141ft-lb@2200
"3B" 3.4L, 20:1 compression, 4cyl diesel
85hp@3500, 152ft-lb@2200
"13B-T" 3.4L (3B oem turbo), 4cyl diesel
116hp@3400, 210ft-lb@2000
"2H" 4L, 20.7:1, 6 cyl diesel
99hp@3500, 171ft-lb@1800
"2F" 4.2L, 7.8:1, 6-cyl petrol
135hp@3600, 210ft-lb@1800
Volkswagen
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2003 1.9L TDI 4-cyl diesel
90hp@??, 155 ft-lb@1900
The good ol' 2F doesn't look so bad in this light, but graphs would tell the story a heck of a lot better than a number at a point in time.