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2003 f250 7.3turbo disel when the front hubs are manually lock in they work great. But they will not lock in auto 4wheel drive will not work in auto have no vacum problems or any other problems that i have found where do i look to fix the auto lock problem
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vacumed line pull the hub lock in auto
check the line at selenoid (right side fender under hood)
for voltaged when in auto and for vacumed then follow line to hubs
check for cut or pinch or rubbed or burned
disconect at hub and test there for vacumed if yes
pull hubs off clean and inspect o-rings
Are you under warranty? Make it the dealers problem if its eligible.
If the front hubs are grinding regardless of being in 2wheel or 4wheel drive it can be the hub bearings which turn regardless. If it grinds only when in 4x4 then the wheel shafts or differential or front driveshaft or transfer case is making the noise because all of these parts move when in 4wheel drive.
I have a 1988 chevy 4x4 that hat the same problem. It was the 4wheel drive switch(works like a selenoid) and screws into the front differential. I was told they go out often although I have only replaced one. This is a picture of it. It can be purchased at most any auto-parts store. Hope this helps. Larry
Hello, If you have auto locking hubs you may want to check the springs inside the hub. The may be all greased up or they may be broken like mine. I changed the spring and cleaned the other one and they worked fine. Hope this helps
there should be 5 or 6 allen bolts around hub. remove these and cover will come off then there is a snap ring on axle and one around the edge of hub remove thes and will slide off
I have the same problems but found the problem. Put a vacuum pump on the hub and see if there is any. I have one that has 30 inches of vacuum and one with zero. The only solution I found was to buy a used one from a salvage yard. The hand vacuum pump is only $40 but you will save over a $1000 doing this.
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