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Don't know about Ford exhaust brakes in 2015, by our 2012 Chevy has an exhaust brake, and it is used in the mountains with and without the trailer in tow, and always in the flats with the trailer. Only thing I know about the Ford I drove a work, is what I was told, and that it had an Allison.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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