Here's a picture of where the Utica number is (or should be) on the transmission; at the rear end of the main housing, just above the pan and below the tailshaft, and to the left. The meaning of the other set of numbers is unknown to me, as are the letters though some have speculated that like some other makes they are the initials of the person who assembled the trans.
The transmissions used the same prefix letters as the engines, A & B for the two Clipper series, C for the Caribbeans, and D for the Patricians and 400s. On the Utica engine numbers, AA, BB or DD indicated the engine was built with a flywheel for standard shift, there was no CC code for Caribbeans.
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