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Discussion Starter #1
I have a 99.5 F350 4x4 with manual lock in hubs and the other day I was following my son while he was driving the truck and I noticed that the axle shafts were turning on the front end while it is 2wd and the hubs unlocked. I don't think this normal and aren't the hubs suppose to free wheel while in 2wd/unlocked? I know this must be what is killing my fuel mileage only 13mpg. Thanks for any help.
 

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TennesseeHillbilly
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1,318 Posts
If they haven't been cycled very much, they can get real sticky over a period of time. It's a simple process to pull them off and check/clean/grease them.

Another possible issue could be the needle bearings inside the hub. If they have become dry or otherwise worn/damaged, they could be dragging on the stub shafts causing them to turn.

Jack up one side and turn the wheel by hand to see if it's turning the front driveshaft. If so, the hubs are engaged.
 
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