Quote:
Originally Posted by Starfire61
........ From the 1961 service manual: ........
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What page?
Quote:
Originally Posted by Starfire61
........ "Two planetary units are used to obtain neutral, three forward speeds, and reverse." ........
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1st = 3.6394:1
2nd = 1.577:1
3rd = 1:1
So far, so good
Quote:
Originally Posted by Starfire61
........ "A fluid coupling is used to provide additional torque multiplication for first and reverse gears and to lock members of the two planetary gear sets together to provide third speed (direct drive). A multiple disc clutch is used to lock the drive torus and front unit internal gear together to provide reduction in the front unit for second speed. This clutch is also used with the fluid coupling to lock the front and rear units together to provide third speed (direct drive)."
"A sprag clutch is used to lock one member of the front or rear unit to the case to provide reduction for first and second speeds." ........
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There was an optional valve body modification on '49-'50 Eighty Eights that disabled first gear, so “Granny” could have a smoother ride. The above description fits it very well.
Only three gears were used, but it was still the same four speed.
Quote:
Originally Posted by Starfire61
........ In 1961, when the fluid coupling empties, this is called the 1-2 shift ........
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1st = 3.6394:1
2nd = 1.577:1
3rd = 1:1
Quote:
Originally Posted by Starfire61
........ In 1962 this is called the 2-3 shift ........
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1st = 3.51:12
2nd = 2.933:1
3rd = 1.56:1
4th = 1:1
Quote:
Originally Posted by Starfire61
........ What changed, engineering or marketing? ........
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Not much chance marketing would be directly involved with trans redesign/modifications.
Quote:
Originally Posted by rocketraider
Chuck- there are NINE different valve body revisions for
1961-64 Rotos ........
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That explains a lot.
Norm