I think it has 4 speed tow/haul but it does not have the newer torque shift transmission with the down shift on braking tow/haul. If it is equipped with an auto. trans.
I can't offer any suggestions on a pack brake for that(7.3) motor.
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Huck & Dodie
2005 RE3 MS #2163
2006 F-350 CC 4X4
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