Chuck B 2004 Windsor Posted October 7, 2021 Share Posted October 7, 2021 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 1 Link to comment Share on other sites More sharing options...
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