AUTOMATIC TRANSFER CASES. The last category is a combination of 4WD and On Demand AWD. These transfer cases have a 2HI, Auto-4WD, 4HI, 4LO and Neutral position and would fall in the general 4WD category. This transfer case has the operating characteristics of both an On Demand AWD and a Part-Time 4WD system depending on the mode selected.
Even though it could turn without breaking off—a step-up from the previous one—the switch would simply blink when turned from 2WD to 4WD. When it stopped blinking 30 seconds later, the light would stay lit up on 2WD even though the switch was turned to 4WD. It was as if the rig was trying to go into 4WD mode, but couldn't make it work.
Received 268 Likes on 209 Posts. For an XL/XLT, when you turn the **** to 4 high an actuator in the transfer case moves to engage the front output and spin the front driveshaft. At the same time a vacuum solenoid under the hood engages both front hubs (integrated wheel ends in Ford speek). Power is split evenly front and rear with no There are two shift motors. 1. Shift motor 1:. 2wd, auto and 4hi to disengage/engage chain drive to front shaft. There is no issue with this operation. 2. Shift motor 2:. To engage/disengage 4lo planetary gear reduction. 4lo issue could be seized slider due to wear or bad shift motor. For all wheel drive to work when reversing, a vacuum-actuated "throttle control element" is installed on the differential case. This device locks the freewheel mechanism when in reverse gear. The freewheel mechanism unlocks when the gear shift lever is pushed to the right pass the 3rd gear. Can anybody explain what the AUTO 4WD does? Does it make the truck perform like an AWD (all wheel drive) vehicle like a Audio for example where there is always power to all 4 wheels, BUT they are not "locked" like in regular 4wd offroad? OR, does it only "kick in" when one of the wheels r8rR.
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    • how does auto 4wd work