All that "low rpm" torque doesn't really mean that much when the engine only revs up to 2800 rpm. If you gear it to give it similar road speed range in each transmission gear as a stock Wrangler with a Pentastar, then it would be equivalent to having a peak torque of 267 ft-lbs at 3600 rpm, and only 137 ft-lbs torque at 5600 rpm. The stock Pentastar already has 250+ ft-lbs torque from about 2000 rpm all the way through 5400 rpm. But you probably wouldn't gear the vehicle that tall (probably not physically possible... would require something like 1.60:1 axle ratio), so you'd end up with VERY short gears, with tons of torque at very low speeds. The first few transmission gears would probably be useless for street driving in 2HI, and 4LO would be useless except for the slowest of slow rock crawling.
These low-revving, huge low-rpm torque diesel engines are designed continuous high-load work in construction equipment, or getting very heavy loads moving from a stop (loaded up semi trucks, etc).
Just want to make sure you understand what you're getting yourself into.
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