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I'm currently experiencing some problems I can't pinpoint on my 1999 F-250 Super Duty with a 5.4l. For starters the windshield is allowing water inside the truck which I believe is the main culprit here. When I turn off the truck everything goes crazy, my heater goes on/off, dash lights stay on, loud clicking sounds from the fusebox area, you can open the wipers, heater, power windows and everything without the key. Problem #2 is my truck shifts / downshifts very hard and gives a sturdy shot on the driveshaft. I changed out the speed sensor on the differential and it helped but now it started again.