Why does my steering wheel wobble when I turn?

[CLIPPERS]

I only notice it at slower speeds, but once in a while, when I turn and brake at the same time the front end pops, then it pulls very hard and the steering wheel won't stay straight as I try to go down the road. When I stop the truck and turn the steering wheel each direction completly it goes away. Any ideas on what could be causing these problems? I would like to try and have an idea before I head to the mechanic, THANKS!

[CT Performance, Inc.]

Check to see if your hubs are locked..

[CLIPPERS]

They are in the auto position. I rarely ever lock them in, just leave them in auto.

[CT Performance, Inc.]

Double check them..have seen them stick.

[CLIPPERS]

Well I went out and put it in 4 wheel drive and drove around some and then took it out of 4 wheel drive and the steering seems to be fine now. If a hub is bad, is it possible that one gets engaged or hung up somehow without being in 4 wheel drive? It seems to happen when I'm pulling a loaded trailer without ever touching the 4x4 switch, like one hub engages. Thanks for responding.

[CT Performance, Inc.]

The vacume line could get pinched and hold pressure or build up pressure from elevation changes and will lock the hub.

[CLIPPERS]

Where does the line run that it might get pinched or where should I look to see if thats the case because altitude is a non-factor here in north Missouri. Any other ideas?

[CT Performance, Inc.]

It runs to the top Knuckle..small line can't miss it look from the front.

[Betaracer]

Check the u-joints. I thougt I had an issue with the steering components but it ended up being the u-joints binding.

[gary2070]

If you disconnect the vacuum to your hubs('06) can you use them as manual hubs or do you have to buy a new set.