Quote:
Originally Posted by PetChemMan
......... in some literature the factory called them "4S" transmissions ........
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That is because they actually had four speeds.
Quote:
Originally Posted by PetChemMan
......... with a small fluid coupling that gave some initial torque multiplication off the line ........
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A couple of things wrong with this:
- All Hydramatics, from '39 until the last Jetaway, used two planetary sets. Each used one clutch pack and one band, giving it two gear ratios, for a total of four speeds.
- During the redesign, they did add a fluid coupling, but they did not add a torque converter.
- No torque converter, no multiplication.
- If the coupling worked in the manner you described, the front and rear planetary units would add up to four gears, and your coupling would add a quasi fifth.
- If, they had eliminated one of those units, the same scenario would have a two speed trans, with your magic coupling supplying a third.
Where is the missing gear?
Norm