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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.If the Jeep runs smoothly and the problem is gone with the front shaft removed then the problem has to be with the drive shaft of the front diff. Its possible the used drive shaft is defective as well. I would consider having the drive shaft balanced and see if that solves the vibration. .