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Allison transmission retarder

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An Allison transmission retarder provides secondary vehicle braking via the transmission. Transmission retarders are usually more effective than engine brakes at lower RPMs; at higher RPMs, they tend to even out. Transmission retarders generate a lot of heat and their maximum braking horsepower is usually limited by the RV's cooling system.  I do not remember any Monaco coach coming from the factory with a Allison retarder.  Fortravel used them.  Chuck B 2004 Windsor

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