I looked at a description of the Jeep transfer cases here
http://www.answers.com/Command-Trac, but none of them seem to match up.
The Series trucks, up to 1983 or 84, used a part time 4wd system. You could be in rear wheel drive only in high range, or you could engage a dog clutch to connect the front and rear driveshafts. You could shift to low, where that dog clutch was automatically connected. This seems closest to Command-Trac.
The Defenders, the Discoverys, and the early Range Rover Classics used a full time 4wd system. It had a differential in the transfercase that could be locked or unlocked at will in either high or low range by moving the transfer case lever sideways (the CDL). When it was unlocked in high range, you could spin a wheel easily on wet roads because all the power can be sent to one wheel out of a possible 4.
This seems closest to the Quadra-Trac without the limited slip feature.
Range Rovers from 1989 on had a viscous coupling that would automatically lock or unlock the CDL, so their transfer case levers can't move sideways. Similar to Quadra-trac?