Mopar starters are very reliable usually , it could be a problem with the rebuilder , I installed 4 in my Warlock , finally the rebuilder refused warranty so it took the starter apart & found the problem there was a coating on the contact ring so I took it back to the rebuilder in Pieces I showed him why they were having the problem . Heat is usually the the reason they have problems especially around headers ,, you could try wrapping the starter or building a heat sheild