Mine's an 87 Samurai, but there isn't any "power band" without RPMs.  I think of it as a motorcycle with 4 wheels.  I dunno, but I reckon all little 4x4s with gasoline engines are the same.  Back in the day, folks were fond of swapping in VW Rabbit Diesel engines, but I think that was a flash in the pan. Although the diesels might have had some torque at low RPM that we don't get with gasoline engines... 
But I'm an idiot who don't know nuffin.
  :-)
- ZM