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Crown Automotive progressive couplings are Jeep replacement parts used in the vehicle's transfer case to transmit torque from the rear to the front wheel and vice versa. This is required to keep the vehicle's performance at optimal levels. Replacing old or malfunctioning Jeep progressive couplings is crucial to maintaining the performance of your vehicle. These Jeep replacement progressive couplings are made with durable materials that resist wearing to ensure they last longer without being impaired.