Question about 1986 Ford F150 SuperCab
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Posted on Jan 02, 2017
I am guessing the way you wrote this that the switch moves but 4H is not activating. If this is the case, then check the fuses/breakers as described in your fuse/relay section of the manual. If these are good, then check the connections to the 4x4 motor on the txfer case. Sometimes the connection there gets corroded or damaged while 4wheeling.
Also, the vacuum operated ft wheels must have good vacuum to the front diff (you will see the vac line on the right side of the diff AS WELL AS the two vacuum switches on the passenger side, firewall under the hood. The fuses/relays/breakers are first to check. Then check the vacuum lines under the hood to the TWO electronically activated vacuum switches on the firewall. Lastly, check the vacuum line to the differential and the connection to the actual transfer case actuation motor..
Posted on Feb 27, 2009
SOURCE: Ford F150 4x4 Passenger side hub
is the sound like a gear jumping noise?if so check the hub assembly and the spline inside the front differential........more than likely the hub assembly
Posted on Mar 22, 2009
You can try several things. You can stop the vehicle as if you are going into low range and shift the high range 2h, 4h, etc.. Ford advertises the Electric button type as "shift on the fly" but does not say the gears are synchronized to do that with manual engagement.
Change the lube this time to see if the lube is Milky. There have been floods, otherwise the case is sealed whether you park it or drive it. You still could have rust on the shift linkage. You need to move the linkage as you spray it. Then the offbeat chance something was bent from offroading. A Salvage Yard is a wonderful place to learn how a car is built. You may see their part looks different than yours.
Posted on Nov 15, 2009
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There is a possibility the axel U-joint is binding, this will put side load on the hubs and keep them from working properly. Turn the steering wheel either far right or left and with front of truck off the ground or the front end disengaged, see if the axel shafts turn free, both sides. If there is binding the U-joint(s) will have to be replaced.
Posted on Dec 17, 2009
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