By adapting the low-range gearbox section of an NP203 transfer case to the face of the ever-popular NP205, ORD is able to deliver more gearing without resorting to steeper axle gears. That ...

which is a gear-driven transfer case with an iron housing and adds the gear reduction half of an NP203 transfer case in front of it. This effectively doubles your low range, with the NP203 ...