Help identifying parts

[Caman96]

I’d contact them, they’ll probably send you some information on your unit.

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RACING AND TOWING PERFORMANCEOVERDRIVE ECONOMY The Absolute Highest Horsepower Handling Overdrive you can buy! Gear-Splitting Performance and Overdrive Economy. For RV’s, Trucks, Muscle Cars, Hot Rods, and Racing. The Finest Quality Auxiliary Transmissions. The Ultimate in Horsepower Handling...

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[GoToGuy]

It's not an Auxiliary transmission , it's an overdrive unit, the intent was providing an overdrive , cruising transmission, when so many hot rods had high ratio , performance rear axle gearing. Lower rpm at highway speeds, better fuel mileage.