ale raczej po asfalcie nie jeździj nawet na auto bo reduktor za długo nie pociągnie
ale dlaczego ? to wg tego wszystkie pozniejsze dwojki powinny miec rozsypane reduktory bo ciagle jezdza na auto

a zasada dzialania jest praktycznie taka sama jak przy 4wd auto. Zasada dzialania 4wd auto wyglada jak w opisie (ang):
The system used in the early second generation Explorers was very similar to the later second gens. The '95 and '96 model years used the same transfer case as the '97-01 in conjunction with a Center-Axle Disconnect on the front axle. In 2wd mode, the transfer case is unlocked, and the CAD essentially breaks the passenger side axle shaft between the front differential and the passenger side halfshaft. That allows the front differential to stop turning, leaving the driver's side wheel to drive only the spider gears inside the diff.
When you engage 4auto on a '95-'96, the GEM switches the signal to a vacuum solenoid which locks the CAD, thereby connecting the front half of the drivetrain and forcing the front driveshaft to turn with the wheels. Then, when the GEM determines that the rear wheels are turning faster than the fronts, it momentarily locks the transfer case, linking the front and rear driveshafts together for a period of time. The GEM then unlocks the transfer case, checks for slipping again, and, if necessary, locks the transfer case again. This produces some clunking and unconventional engagement and disengagement that many people don't like.
czyli rozni sie ten system tym ze wczesniejsze dwojki mialy owa slynna juz

wolnobiezke ktora po zalaczeniu 4wd auto jest "zapinana" i polosie oraz przedni wal kreca sie caly czas w trakcie jazdy, tak jak w pozniejszych dwojkach w ktorych nie ma wolnobiezki i kreci sie to wszystko nawet w pozycji 4x4 auto.