Intermittent Left Pulling 02' F-250

[rcthorp]

This is a weird problem. I have noticed that roughly twice a mile my truck will pull hard to the left for a second then "release" back to my normal alignment. Mechanics around me are baffled. I have troubleshooted and remembered that I had been running with my hubs locked in for a while, roughly 8 months or so. Then maybe a month ago or less I unlocked the hubs, feeling that I wouldn't need the 4x4 much in the next few months. That and I was wondering about using the "auto" position for 4x4, I don't really understand how that works. That's when the issues started. A few days ago I locked the hubs back in and the problem has gone away. Does this seem reasonable that in the unlocked "auto" position I could feasibly have some weird locking/unlocking thing going on that wouldn't be possible with the hubs locked in?

[mostlystock]

most likely the u-joints in the front axles. One of them is probably seized.

[fomoco]

about 3 months ago i had the same problem. I found i had a bad u=joint and a broken lockout on the driver side. R&R both and fixed the problem also wile you are there you might want to check the neddle brg on the hub it is a replaceable brg the part # is SKF B2110 bearing.

[trackman]

Yep Check Front Axle U-Joints at the Hub Pivot Point.
I have a Good Thread in here where I fixed Mine.
TooMuch to Type out, Search My Threads, Tells a Good way to Prove U-Joint is Issue.