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Subject: On the fly 4 wheel drive

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Bob_Detling___ User is Offline

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06/26/2003 5:12 AM
I have a 99 Ford F250 super duty powerstroke with on the fly 4 wheel drive. When I turn the switch to engage the 4 wheel drive nothing happens. The 4x4 light does not even come on. The light does come on on initial start up so I know the bulb is OK. There was no indication of any problem prior to this. It seems that there is no electrical power to it or perhaps a bad switch. Any Ideas?

unknown___ User is Offline

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08/07/2003 8:14 AM
------------ Bob Detling at 6/26/2003 5:11:51 AM I have a 99 Ford F250 super duty powerstroke with on the fly 4 wheel drive. When I turn the switch to engage the 4 wheel drive nothing happens. The 4x4 light does not even come on. The light does come on on initial start up so I know the bulb is OK. There was no indication of any problem prior to this. It seems that there is no electrical power to it or perhaps a bad switch. Any Ideas?

todd_brinson___ User is Offline

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09/15/2003 11:48 AM
Bob, My 2001 Expedition was doing the same thing. Take it to the dealer and have them replace your 4x4 sensor. The way Ford does their 4x4 these days it's on a vacuum system and sometimes the sensors that tell the 4x4 to kick in go faulty. After they switched mine I was good to go. ------------ Bob Detling at 6/26/2003 5:11:51 AM I have a 99 Ford F250 super duty powerstroke with on the fly 4 wheel drive. When I turn the switch to engage the 4 wheel drive nothing happens. The 4x4 light does not even come on. The light does come on on initial start up so I know the bulb is OK. There was no indication of any problem prior to this. It seems that there is no electrical power to it or perhaps a bad switch. Any Ideas?

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03/04/2004 11:15 AM
------------ Bob Detling at 6/26/2003 5:11:51 AM I have a 99 Ford F250 super duty powerstroke with on the fly 4 wheel drive. When I turn the switch to engage the 4 wheel drive nothing happens. The 4x4 light does not even come on. The light does come on on initial start up so I know the bulb is OK. There was no indication of any problem prior to this. It seems that there is no electrical power to it or perhaps a bad switch. Any Ideas? Bob, I see that one person advised you to have the sensor changed. Did this fix the problem? I have a '99 F-350 with the same exact problem.

unknown___ User is Offline

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03/04/2004 12:27 PM
------------ Ron at 3/4/2004 11:15:09 AM ------------ Bob Detling at 6/26/2003 5:11:51 AM I have a 99 Ford F250 super duty powerstroke with on the fly 4 wheel drive. When I turn the switch to engage the 4 wheel drive nothing happens. The 4x4 light does not even come on. The light does come on on initial start up so I know the bulb is OK. There was no indication of any problem prior to this. It seems that there is no electrical power to it or perhaps a bad switch. Any Ideas? Bob, I see that one person advised you to have the sensor changed. Did this fix the problem? I have a '99 F-350 with the same exact problem.

unknown___ User is Offline

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03/04/2004 12:30 PM
I had to replace the motor that engages the transfer case. It now engages the 4 wheel drive but now, the front hubs do not engage automatically all the time. I have to get out and turn them by hand. ------------ Ron at 3/4/2004 11:15:09 AM ------------ Bob Detling at 6/26/2003 5:11:51 AM I have a 99 Ford F250 super duty powerstroke with on the fly 4 wheel drive. When I turn the switch to engage the 4 wheel drive nothing happens. The 4x4 light does not even come on. The light does come on on initial start up so I know the bulb is OK. There was no indication of any problem prior to this. It seems that there is no electrical power to it or perhaps a bad switch. Any Ideas? Bob, I see that one person advised you to have the sensor changed. Did this fix the problem? I have a '99 F-350 with the same exact problem.

unknown___ User is Offline

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06/08/2004 6:33 PM
IT THE TRUCK HAS MANUAL LOCKING HUBS THEY HAVE TO BE LOCKED TO SHIFT ON THE FLY. THE FRONT AXLE HAS TO BE TURNING IN SINK WITH THE REAR AXLE TO SHIFT AND NOT TEAR UP ANY GEARS. IF THE TRUCK HAS AUTOMATIC LOCKING HUBS THEN YOU DO NOT REALY HAVE SHIFT ON THE FLY. THAT MEANS THE FRONT AXLE DOES NOT TURN UNLESS THE TRANSFER CASE IS ENGUAGED TO MAKE THE AUTOMATIC HUBS LOCK ------------ Bob Detling at 6/26/2003 5:11:51 AM I have a 99 Ford F250 super duty powerstroke with on the fly 4 wheel drive. When I turn the switch to engage the 4 wheel drive nothing happens. The 4x4 light does not even come on. The light does come on on initial start up so I know the bulb is OK. There was no indication of any problem prior to this. It seems that there is no electrical power to it or perhaps a bad switch. Any Ideas?

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