Yes it is a dodge shaft mount speed reducer, The direct hydraulic drive are called Hydroil, Dodge is now owned by ABB is a shadow of its former self. If it is a stock Hydroil the motor is probably a Denison, now owned by Parker. In the mid seventies I would order 25 Dodge shaft mounts of various sizes and ratios every January for the spring rock quarry start up and season. Usually by June they would be gone. At 25 pcs there was a pretty good price break