With the hubs locked in there is a vibration at 55 mph and higher in 2 wheel drive.
SOURCE: 4 wheel drive selector won't move to select 4x4
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..
SOURCE: Truck has a noise vibration when hubs are locked
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.
SOURCE: 1995 ford F150 4 wheel drive will not engage the
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.
SOURCE: Driveline vibration 2007 Ford Fusion AWD
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) :)
SOURCE: I don't see how to remove rear hub on my 1996 Ford
You will need a special socket to remove the bearing lock nut.
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