I used to drive a fuel oil delivery truck that was an old B model like that one. It had the Mack Thermadyne with a the two stick Mack 10 speed. It was not two transmissions or a two speed axle either. It was a true two stick 10 speed. It was a fun truck to drive. I also used to drive an old U model Mack that had the early Maxidyne in it with the Mack version of the two stick 4x4 transmission. You haven't really had fun until you've driven one of those.