Question about 2001 Ford F150 Styleside SuperCrew
With the hubs locked in there is a vibration at 55 mph and higher in 2 wheel drive.
The front hubs are activated with vacuum. You have a vacuum leak or bad chech valve in the line. Check the lines that are near the firewall and see if they are ok.
Posted on Mar 30, 2014
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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
Could be a few different things. I really doubt the carrier is bad on the truck. I would be looking at the axle half shaft u joints on both sides, and or the cv and u joints on the drive shaft to the front differential. If one of these u joints are bad it can make all kinds of noise and cause vibrations. Especially when under a load. Good luck.
Posted on Mar 09, 2009
I have a 96 with loking hubs. as long as you have locked the hubs(both) and the bulbs are good. Sounds like a sticking sensor.
Posted on Nov 28, 2009
Has the car even been in an accident? If so it could be a bent frame (worse case), Otherwise the car could be off balance and needing an alignment (Most likely - best case) :)
Posted on Dec 28, 2009
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