could be several reason depening on year, automatic hubs or manual push button on lever shift could be actuator on the diff you need to give more info on year and style of 4x4 sytem it could be a fuse broken wires there4 are so many options
Probably the sending unit.
4X4=12
Who cares
5500
See link.
4x4 on kawasaki 650 vnot working
No, not all Ford F150's are 4X4's. For a newer Ford truck you are going to be looking at around $4000 more for the 4X4 option. The older trucks the gap is less, say around a $1500-2000 difference if price.
( 5 ) lugnuts for each wheel
no
6 x 135mm
14 mpg
F150 4x4 drive shaft balanced