Yes Glen, It should have a ST 400 transmisssion with a variable pitch converter. I would bet the engine was replaced as well, or the transmission was replaced because the engine was replaced. That dynaflow only fits 57-63 Nailheads easily. Fitting the dynaflow to a 64-66 nailhead reqires swaping the crank.
Check the referrence section on this site to identify the engine. There are engine codes there that tell the year, size, compression and carb type of the engine.
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