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How many miles are on your Jeep?
Are you using factory or aftermarket starters?
the rebuilt starters could be your issue but those engine did have a lot of starter issues because of the location and the heat. You Can try a new starter but i would also recommend check the battery cables and their connections at both the battery and the block for the ground cable and the starter for the positive cable make sure the connections are clean. Also make sure the heat shield is there for the starter
let me know if you need any more help