twodownzero wrote:
There are no Lincoln Navigators with "freewheeling" front hubs, so if that is your concern, then you might as well not worry about that.
Front-hub actuation is vacuum controlled by a solenoid commanded by the PCM. While the SuperDuty trucks are normally disengaged, and use vacuum to engage them (with a manual override), the light-duty Ford trucks are normally engaged, and uses vacuum to disengage. This way you still have 4x4 in case of a vacuum leak, since there's no manual override.
If you're thinking the Navigator has fixed front hubs, that is incorrect.
If you have a Navigator with the 2-speed Transfer Case, Neutral Towing is built-in feature, and it disengages the front hubs when the T-Case is placed in that mode. Prior to this being a built-in factory option, Ford sold a "Neutral Tow kit" so you could manually disengage the front hubs by means of a 2nd downstream solenoid.
With the factory flat-tow configuration, in there event vacuum did leak and the hubs did engage, if wouldn't matter because the T-Case would still get lubrication from the rear drive-line spinning. This would not be the case using a driveline disconnect.
FWIW -
Navigator Neutral Tow Procedure
