I swapped motors after i broke a valve on my 5.0. After having everything ready got it started and it was leaking anti freeze from the back of the upper. Fixed that and tried to start it but the starter was just grinding!!! ugh horrible sound turns out the thread were bad for the top starter bolt so the bolt came loose. Quick thinking instead of dropping the tranny i used right angle drill and drilled out the piece of bolt stuck in there. Now my starter grinds so it must be off since i used a bolt and nut??? if it is it couldn't be by much at all cuz it didnt take much drilling....I also swapped the solenoid as well with the same result..oh and swapped starters too...same thing..any suggestions to diagnose?