I engage the four wheel drive in my 2005 Ford F-150 when we had a snow storm this week.Now when switching out of fourwheel drive the transmission wines until you switch it back to fourwheel drive high.Tried putting transmission in reverse & switch from 4wd to 2wd High.that works until you reach 25 mph & starts wining again. Any suggestions before taking to dealership.

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4x4 not working - Ford F150 Forum - FordF150.net

Something has let loose in the transfer case. Probably bearings. Better get another or have that one fixed. Keep driving it and the case will blow a part. This could damage the transmission also.

Check and make sure it didn't blow a fuse. If it blows it won't allow it to do anything.

hi
yes seems like you switch is faulty.]
replace the switch
Thanks

you have a lever or switch that engages 2wheel normal driving 4 wheel high for wet slippery conditions ,then you have four wheel low for real muddy and deep snow conditions
normally change from 2 wheel to four wheel high on the move .important nearly all 4 wheel drive vehicles must be stopped to engage low otherwise do damage to transmission

The switch is to put the vehicle into four wheel drive for off-road and increased traction on snow and ice.

There is a TSB for replacing the IWE ( Integrated Wheel Ends ) solenoid, as the 1st design can ingest water and introduce it to the IWEs, causing low vacuum, and the gears for the IWE are grinding.

http://my.voyager.net/~sscully/file_tsb06_08_15.pdf

To cure this until you get the new IWE solenoid ordered and installed, pull the vacuum lines from the IWEs and plug them. This will leave the IWE gears engaged, so they are not trying round off the teeth.

There are 2 lines to the IWE, 1 is the vacuum line, the other is a vent line, that routes into the engine compartment, with an open end, make sure you pull and plug the correct line.

This will have the front hubs engaged to a dead axle, so it will decrease mpg, and you will feel a bit of loss of power, but better than ruining a set of IWEs that will cost ~500.00 to replace.

tap on the 4wd motor on the transfer case while someone is pushing the button, if engages you need a new motor

Turn vehicle on, with foot on brake put vehicle in NEUTRAL. Still holding brakes move 4x4 switch to 4 wheel drive, it should engage. The ECT snow is just s feather that make the transmission take off in 2nd gear so its not a fast take off and you wouldn't skid. Good Luck

I am going to ask a dumb question....do you have it in neutral and the brake mashed when you switch to 4WD LOW? I believe that is what my book says to do.