Tech help Please

[rowcoach]

How do the auto hubs work on an 06? Is it vacuum to lock or unlock the hubs? I have a crazy pull going on after a turn in either direction. The truck will pull in the direction of the turn. This is very intermittent. It goes straight after what ever is hanging up lets loose.

Any help and suggestions will be greatly appreciated.

[Evil Eye]

I would think it is more likely a brake hanging up than a hub. Vacuum locks and unlocks the hub based on the position of the switch. If the switch isn't engaged, it won't lock them. To confirm it isn't your hub, manually unlock them. (I'm assuming they are in auto right now). Drive it around several corners and if it is still pulling, then your problem is somewhere else.

[rowcoach]

Just replaced all calipers and pads. I'm suspecting vacuum because it's so intermittent. Does vacuum engage the auto hub or hold it disengeged? I will try locking the hubs tonight.

[Evil Eye]

Yes, I'm pretty sure that vacuum engages the hub.

[rowcoach]

Thats what I thought. I'm hoping it's not ujoints. They look to be a big pain to change.

This has me stumped.

[Evil Eye]

Wow, u-joints already on a 2006? That seems kind of early with only 5 years on the truck, although these trucks seem to eat ball joints, so I guess anything is possible. Please keep us posted on your results.

[rowcoach]

Looks like ujoints. Locked the hubs and drove in 2wd for a few miles. The first half mile was rough but they loosened up and it drove without issue. It has not pulled since. Any recomendations on ujoint manufacturers?

[NYC F-350]

I just went through this same thing on my way to Laconia New Hampshire for the Bike Rally this past weekend. I spent yesterday replacing the balljoints and the axle u-joint on one side. Problem corrected, but I did find alot of needlebearings and metal slivers in the hub.
Thinking a new one is in order soon.

[rowcoach]

I was looking at the hubs first. I can't find a replacement from anyone but the dealer. If anyone knows of any please post. Warn has nothing for superduties after 2004.

[NYC F-350]

Actually, I think you need to call Warn. I believe they do have something but they haven't updated anything online in so long it doesn't show.

When I had the axle in my hand it was obvious my issue was the u-joint. 1/2 of it would not turn at all and was fused to the caps. The caps were spinning in the yoke instead of on the needle bearings.