The 99-01 Lincoln Navigaotrs had the transfer case/locker option with "AWD". It had the full comtrol system to go AWD,2WH and 2WL. The AWD put out power to a 40/60 ratio, whereas the 4WH+L did lock the axles together.So, AWD and locking transfer cases are possible, just nor probable. FWIW, the new Navi's have the road only AWD and no low range. Hence, I never will buy another 'Gator.
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Had-94,96,98,99 Cobra Stang,99 Navigator,03 Expy, 05 H2
Have-08 Titan C/C,06 GCSRT-425FTLB & AWD, other junk..
Want-08 Viper, 06 M5 
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