I don't know much about the auto locking hubs or how any of that works. I asumed that the axles are locked all the time right? But, what locks the front diff in? Is this the ADD? What is it and what does it stand for??? Thanks for the info.
More info is helpful on this.
Did you see any improved fuel milage by installing manual hubs?
Shawn
ADD, Automatic Disconnecting Differential.
Here is a picture of the ADD setup. The actuator moves the collar in or out to disengage or engage the drive axle. With ADD you are always turning the front diff as you drive (the drivers side front drive axle is always engaged and the actuator engages the other axle in 4wd).
