OK this is a three speed - 4 range HydraMatic, and when you read the H/M service manual it speaks to you in these terms, and most of the time it's speaking to you as a 4 gear trans. With Super HydraMatic L is 1st & 2nd, With Roto L is 3.50 and 2.93 or 1-2 range and it's all done in the coupling.
So what it says in diagnostic's for Roto is: Drive in First, Second, and Fourth ( skips drive RT or S ) 1. Control valve assy. 2. Coupling
FYI 1952 HydraMatic became Dual Range and Super HydraMatic continued with that along with Roto, and the later call it Drive Left and Drive Rt. by 1964 the column shift cars adopt what Oldsmobile had been doing all along and trade drive right for "S". I believe the console models in 62 use the "S"
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