So i came here for help i dont have an F-150 I have a ford Explorer pretty much the same. I have the Control-Trac system BW4405 T-case. I notice in Auto and 4HI When i go around a corner my front tires can be on cement And the rear on sand and the rear will start spinning somewhat and the back end will slide.

I thought in 4HI the front and rear driveshaft is locked So why is the rear allowed to spin without the front spinning???


I really Need help gueys


Thanks.

 

I think your t case has a center diff

 

I was looking at that to it does not have a center diff. Its a part-time transfer case AUTO 4Hi 4LO I was just thinking about locking it completely i was going to run some bolts through all the gears etc.. The lock the whole damn thing.

 

What year is your Explorer? Something is wrong. Here is an explanation of how the system works;
Hall effect sensor monitors input and output shaft speed.

In the A4WD (C-Trac) system, the GEM varies the torque sent to the front driveline by controlling the transfer case clutch. At rest and under cruising conditions, the GEM activates the transfer case clutch a minimum duty cycle (percentage of time the clutch is turned on), which allows for the slight difference between the front and rear driveshafts which normally occurs when negotiating a corner on dry pavement. Under any of the following conditions, the GEM will increase the duty cycle in order to prevent or control slip:

l Slip is detected (by using the Hall Effect Sensors)

l Heavy acceleration (throttle position).

A code reader capable of pulling GEM codes would be an asset at this time.

The two most common failures are the clutch and the sensors.

Regards

Jean Marc Chartier

 

When the t-case is in AUTO 4wd the center axle disconnect will allow the front and rear axles to spin at different speeds. My ex had an explorer with the control trac system and when it was in auto 4wd you could get it stuck in about 1" of snow, first the rear wheels would spin about 1/2 turn then the front would spin 1/2 turn and the axles would keep alternating like that creating a nice set of holes that it could not climb out of, makes you feel proud when you have to ask for a tow because you are stuck in 1" of packed snow.