I am a new owner (1 week) and have never had these discussions with anyone before. The understanding that I had was that the Disco was a real-wheel drive system when in 2WD like a Jeep or Bronco. The diff lock would then lock the front and rear axles to spin at the same speed to improve...

... I ask questions to learn how to fix it. Can't just wing it. I think the best way for "junior members" to learn to to ask questions which "senior members" can possibly answer, if they so please. I have to learn somehow, right?

Is the rear axle not the standard drive axle in the case of the Disco? Is the right front wheel the drive tire in the case of disengaged operation?

The front prop spins, but not the rear. So its the rear end... is this something that I can fix myself?

I have a 96 Disco and the truck won't drive without the diff lock engaged. The diff lock shift lever will move where it needs to in the ways it needs to, but the transmission will not actually engage (or the wheels won't turn). The diff lock light on the dash turns on when the shifter is on...