4x4 problems

[red7.3d]

I have a 2000 f250 with the 7.3 when i bought the truck it had the stock vacuum hubs but they locked all the time so i bought a set of warn hubs to fix that problem but here is the new problem. I lock the new warn hubs in lock the transfer case in and i can here the tranfer case lock in but hubs will not engage.i put two new sets of hubs in and still the same problem. Anybody have an idea

[fireguy942]

It's the auto switch for your 4wd? It Sounds like It's either not engaging into the from driveshaft or the motor has gone bad.

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[red7.3d]

After i turn the switch to lets say 4low i can hear the transfer case lock in and the truck will torque up and sometimes the hubs will pop i have put the truck on jackstands to chech everything and i can tell transfer case is working so it has to be something with the hubs. I do have alot of play in the axles that go into the hubs i thought maybe that was it because i can pull the cover off the hubs and use my finger to actuate the hubs and they will lock in but when i put the warn covers on with the turndials it will grind and act like the hub gear wont catch the axle splines

[JSchuricht]

How much grease did you use when you assembled the hubs?

[ZMANN]

r u sure u bought the correct hubs ?

[red7.3d]

My first set i put in i just lightly greased them and after falure i called warn and exsplained the problem.they said it sounds like faulty hubs so i got a brand new set and left all the factory grease the they said dont add grease but still having problems.i know they are the right hubs for tje truck i had warn pull the part number as well as several local parts houses around my panama city area and they all say its right. I personally installed them and im sure its not a installation problem because all videos forums instructions of any kind shows i have installed them right

[JSchuricht]

The reason I asked about the grease is because if you have too much it will make it hard for the lockout to fully engage which can cause the pooping sound you described. Did you start with Ford auto hubs and switch to the warns? It's been a while but IIRC the auto hubs and manual hubs use a different spindle nut.

[cghoerichs]

1. With someone looking at the front drive shaft put the truck in 4wd and drive. Does the front drive shaft turn? No, check everything related to transfer case. Yes go to 2.
2. Jack up the front of the truck.
3. Truck out of 4wd and both hubs set to free - Turn the u joint attached to each front wheel. Do they turn freely? If one does not that hub may be damaged. Pull hub for one that doesn't turn and try again once hub is out. If they turn freely goto 4.
4. Put 1 hub in lock. Turn ujoint on that wheel. Turns freely hub is damaged. Locked? Repeat 4. on other wheel.