Quote:
Originally Posted by Matt Monson
The AL /61 was used for several years in the SC and were fine spline. Only the 77 mag case version was coarse.
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Quote:
Originally Posted by Trackrash
I would have guessed that the fine spline drive flanges corresponded with the change from the 7:31 to the 8:31. Porsche changed form the 4 bolt 108mm drive flanges in 75 1/2 which corresponds to the change to the 8:31 FD?
Maybe the experts can confirm. I don't think there were any course flange 100mm CVs?
EDIT: Thanks Matt, you beat me to it.
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According to PET, the coarse-splined 923 flanges were used in 915 transmissions up through 1979.
The transition occurred either during or after the 79 model year.
See Pete Z's timeline in post 12 here...
http://forums.pelicanparts.com/porsche-911-technical-forum/548265-83-3-0l-engine-trans-swap-85-3-2l-engine-trans-axle-options.html