Its a very tight fit ,but the way to get at it ,is to take a long extension and come at it from the front over the cross member of the engine with a 13 mm wobbly socket.
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If the bolt head strips on you, sears has a kit that are bolt head grabber sockets that might help out.
While replacing the starter on a F-150 is not difficult, not having the right tools will make the process a nightmare. One of the reasons for this is because of the location of the top mounting bolt. Because of little room and a nasty location, this bolt will require a certain length extension and socket in order to be removed. Everything else is straight forward.
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To Order car parts online:--To get heavy discount on car parts .Click this link below:----
http://technoanswers.blogspot.com/2011/05/from-where-to-order-car-parts-online.html
For car error code diagnosis click the link below:---
http://www.automd.com/diagnose/?amdcid=apwldrbrd1
Car no start:--
http://technoanswers.blogspot.com/2011/05/car-will-turn-over-but-will-not-start.html