ok so what do you recomend I do? I'm thinking just to upgrade to the cst 4" spindle.Unless Fabtech has changed their spindle design for the TB trucks, (which I dont think they have) the issue is not from the wheels BS.
The Fabtech spindle for this truck was taller than stock, ball joint to ball joint. This meant that instead of the arms being parallel, they were now farther apart at the spindle forming a trapazoid shape. This change in geometry caused the wheel to move in a arc like an I beam truck instead of a more vertical path. If you tried to crank the TBs any little bit it would not align. Really sucky, if you watched the front wheels going over a speed bump they would flop all over the place. I owned this style spindle for a short time before I trashed them for some CSTs.
Check your spindle height compared to stock and see if its the same. If they are taller, their is your issue. If they changed them (same as stock) you might have a worn ball joint, hub or alignment cams.