the issue with signal mismatch is just limited to the front hubs when a new hub is installed one side while the other side retains it old hub, since you have replaced both front hubs i tend to believe it is not the fronts at fault. Though the ABS module should be scanned for codes as it could be possibly one of the new hubs could be at fault and the code will identify the component that set the fault. Checking the dtc code is always the first step in diagnosis as to identify the component at fault and to begin testing in the proper location. Since these vehicles are notorious for the rear axle sensor going bad, you could replace it to see if this corrects your fault, as these sensors are no more than $30 and every explorer will eventually need the updated sensor, if this is your fault you will have corrected it, if not then you have prevented a future fault from the rear axle sensor. Again, i highly advise you to have the system scanned for codes so it will identify which component set the code as it is possible that one of the new hubs could have failed already and set the code, or it could in fact be the rear axle sensor, it is hard to tell without knowing the dtc. If you wish you can replace the rear axle sensor and re-drive the vehicle, if this does not correct it then i would definately have the system scanned to determine the fault before you start 'taking stabs in the dark'
Great advice thank you. I will replace the Rear sensor especially since its a known issue (its cheaper than a scan at a dealer or shop) if i continue to get the ABS light on the dash after that when i start to drive then i'll have it scanned and submit the code for further advice.
Also, front differential locking up on and off hard turns (U-Turns) or driving on grass or slightly rough grounds. Can you help or is that a new thread?