hrmm...there could be air in the lines...but they're right, there is no adjustment on the clutch.
Are you sure the clutch is fully disengaging? Try stopping on a perfectly level surface in neutral...put the clutch in, and put it in first gear...the truck shouldn't move, obviously...rev the engine up...if it starts to move, it's partially engaged.
Also, try stopping, put it in first, then shift to neutral, over the R...then back to 1...does everything feel like it meshes smoothly? If not, it's probably not fully disengaging which could be air in the lines.
∙ 2007 F150 FX4 Super Cab 5.4L