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Warford and Muncie made aux transmissions with shifters on top that were 4-bolt but I'm not sure about the ones that were put between the torque tube and the rear axle. There were a lot of companies that made aux transmissions and I don't know all of them. A person would have to be specific on which one they are looking for.
Muncie, Warford, Universal Gear, Brown Lipe Chappin, Lincoln, and Ruckstell are likely the most well known.