I have a 1997 CHevy 2500 with a 454 big block. Due to gas prices it was parked for a few weeks. Prior to parking it the truck had been dragging when you would crank so we knew the starter was going out. When we got the new starter once taking it off a piece of the bendex was missing. My husband found a chewed up bolt in the fly wheel. Once we got the new starter on it we tried to crank it several times and it was trying to fire up when we heard a loud KATCHING and then free spinning. A friend finally fixed it for us and it fired right up after a few tries we drove about 5 -10 miles to his parents when the transmission line came undone and it was parked for a few more weeks. We fixed the line and got a new battery tried to crank it it acted like the battery was weak, And all of a sudden the starter is free spinning again. What could be causing the starter to keep breaking.