Car won't even crank...

Mopar Starters have a well known issue with the main brass bolt that the positive cable connects to on the starter. The motor connects to power through contact to this bolt and over time the bolt will degrade to the point where it no longer makes consistent contact. Your symptoms sound very much like I have experienced while this condition was developing in my starters. Over the years I have replaced many of these bolts which is a little tricky, but not extremely difficult. Good luck!