I've been discussing it in another thread possibly on another website - but can't find it anymore so I've come here. I have a '92 Nissan Granroad Safari LWB. Were there any models to come out with a factory rear diff lock? I'm asking because I've been told its only LSD (best in business), but I've just come onto pavement in 4WD and the rear axle was definately binding up, until one wheel broke loose. It doesn't do that at all in 2WD, only when I've selected 4. Thats got to be diff lock right?