SOURCE: ford f350 drum brake
Don't listen to the last guy. The drum does not just slide off. You have to remove the axle by removing the eight 5/8" bolts and pulling it out. Inside the hub you will find a ratcheting lock nut. Visible will be 4 slots where a special socket fits. You can buy the socket from a parts store or you can just use a 1/4" punch and slowly hammer to slowly thread the nut off. Drivers side is left hand thread while the passenger side is right hand thread. Remove the nut and the outer bearing will fall out (so catch it before it hits the dirt). Then slide the drum off. While you inside there it is a good idea to replace the axle seal. It's about $30 and an easy change.
SOURCE: When in auto hubs the 4 wheel drive doesn't work
They are operated by vacuum. Check to make sure the vacuum lines are connected and not ripped or anything. If that checks out fine, remove the vacuum line from the hub and apply vacuum to the hub, if the hubs lock then the problem is in the vacuum line or switch.
SOURCE: 4 wheel drive (auto locking hubs) seems to be trying to engage.
I had the same thing happen. The automatic locking hubs are faulty, causing one or both hubs to try to engage or disengage onto the front driveshaft. This makes the clicking noise and loud clunking that you hear. You may notice your steering pulling to one side of the road,because one hub is locked in. Replace the automatic hubs with new ones, do not try to fix the old ones. I liked the
convience of automatic hubs but replaced mine with manual hubs, there just way more reliable.
SOURCE: Ford F250 4x4 ESOF
turned to the right 4x4 engaged. turned to the lef 4x4 disengaged. righty-tighty=engaged, lefty-lucy=disengaged. hope this helps.
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