Manual Override

The CVHs  have a manual override selector dial, which, when turned to the LOCK position, keeps the CVHs  locked (via the dial) at all times, regardless of the position of the instrument panel MSS  . (Always set both hublock dials to the same position. If the CVH  dials are manually turned from the AUTO to the LOCK position, and vacuum is supplied to the CVHs  (by switching the MSS  from 2H (4X2) to 4H (4X4 high) or 4L (4X4 low), the CVHs  are locked through the dial as well as through the internal spring mechanism. In this case, turning the CVH  dials back to the AUTO position leaves the CVHs  in (spring) locked mode until vacuum is removed from the CVHs  (by switching the MSS  from 4H or 4L to 2H). (This is not an issue if the CVH  dials have been in the AUTO position and the MSS  has been switched from 4H or 4L to 2H at least once.) The CVH  should be left in the AUTO position for increased fuel economy.