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On the 1720's, are they right and left hand rotation or is it in the transmissions?

They are rotation dependent upon the input rotation to them, meaning one would have to have a means to turn one RH and one LH independently from the drives themselves.

These are very old units, like pre 1980. The 1721 as well as the ASD6 drop box have the rotation, reduction and drop built into them but the 1720's are an inline drive that are a very early version of the inline ASD6, although nothing is interchangeable other than the trim pumps and oil.

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