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No, you won't need an exhaust brake for your '06 D/A in tow-haul mode. Have gone down 12-16% downgrades. Our 5W weighs in at 13,800. Be prepared for some high RPMs to keep the speed down. While you can use the manual mode, the Allison does a great job all by itself. If you are starting to speed up going downhil, just stab the brakes and the Allison will downshift to hold the desired speed. The reason why we now have a D/A is that the "Smart Lock" on our Banks exhaust brake locked up at the wrong time and destroyed the tranny on our '99 F-350. I wouldn't buy a Banks or a BD based on our experiences over the years.
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