4WD Noise when turning

[mechanicsnearyou]

It snowed today as I was driving and I popped my 2003 explorer into 4wd high. At a stop light I turned and heard a weird moaning coming from my tires/axles (i think) and felt it too. I turned again and heard the same thing. I turned the 4wd off and it was gone. Anyone know what this is?

[denisb]

You shouldn't hear moaning at lower speeds as you climb in speed you are more than likely to start hearing a huming noise (similar to a bad bearing) due to the front shafts and differencials turning.

You will also notice some "drive train binding" (almost like breaks are applied) when turning in 4x4. If this is what you mean I would say i's normal, if not, I'm guessing it should be looked at.

[mechanicsnearyou]

Thanks, it was most likely the "drive train binding" that you describe. I havent had it in 4wd since last winter. I will try it out a few times this week to see how it responds.

[shorod]

I assume your 2003 has the "Auto" mode as well as the "4WD High" mode. If so, you really should leave the switch in the Auto mode to avoid the drivetrain binding. Per the service manual, the 4WD High setting is only intended for off-road or severe winter driving.

Per the service manual, the C-Trac transfer case transmits torque to the front wheels through an electromechanical clutch assembly. In the Auto mode, while at rest and under cruising conditions, the Generic Electronic Module (GEM) activates the transfer case clutch at a minimum level. This allows for the slight difference between the front and rear driveshafts which occurs normally when negotiating a corner on dry pavement. Under any of the following conditions, the GEM will increase the torque sent through the clutch to the front wheels in order to prevent or control slip.

l Slip is detected (by monitoring the Hall Effect Sensors in the transfer case)

l Heavy acceleration (by using the throttle position signal from the EEC)

l Very light or zero throttle at speeds above 64 km/h (40 mph) (using the throttle position signal from the EEC)

-Rod