If your truck is driven in wintery conditions where a lot of salt is used. Sooner or later us guys in the 04-08 class will have to get them replaced. Its located above your spare tire on the frame and subseptable to anything your tires kick up especially road salt.
The connectors and case can corrode away leaving you the owner stranded.
There is a new design out on the market that more resistant to corrosion.
But here's the pronblem.
If this goes out on you guys in the next 4-5 months good luck getting one!
The company that manufactured these for Ford went out of business!
There are none left in the parts warehouses or dealerships.
For a temporary fix I suggest finding one out of a junk yard or salvage parts place.
Just thought I'd keep you guys in the loop!
Have a great day!