4x4 front hub
I'm familiar with Ford's vacuum actuated front hubs on their 4x4s and was able to add an EGR solenoid into the system that can be energized to prevent the hubs from engaging on rare occasions when I w...
Forum Discussion
MFL wrote:
I've been doing some reading, and it appears my understanding of Ford's SOTF 4x4 is correct, as of 2013. If I have no vacuum to LOCK my hubs, I will have to get out, turn my hub setting from auto, to lock, and 4x4 will work. It seems sometime around 2015 Ford changed to the opposite, using vacuum to maintain 2wd, and no vacuum moves to 4wd.
Here is a quote from FTE in 2013 "The auto hubs use the vacuum pump. If ever your vacuum pump dies or gets a leak in it. (which I've had happen several times over the years). You will not have any 4x4. By turning to Lock, You can have 4x even though the vacuum pump is lost."
If this is correct then the solenoid that OP is using, likely won't work for my truck.
Jerry
This is not correct ... anyway not on the 2017 to present Super Duty. On the current Super Duty vacuum is directed to the hubs to lock the hubs when 4x4 is wanted. If a vacuum leak is preventing the hubs from locking the hubs must be locked manually to use 4x4.
