Hi. I have a 2008 f350 king ranch. Iíve had it for 4 years and Iíve gone through 4 starters in 4 years. The last one I had put on was supposed to be an aftermarket one that was supposed to last longer. But itís already going out less than a year later. Sounds like gears spinning really fast but the teeth have been ground down and are just bouncing off of the other set of gears. Something is obviously wearing the starter out. What could it be?