Quote:
Originally Posted by Porsche84
The /61 early was a Magnesium case (early 77), the later /61 and all /63 were aluminum. It looks like second gear might have been different and the /63 was the first to have a fine spline on the drive hub. I could be wrong on this but that's what I had in my notes.
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The AL /61 was used for several years in the SC and were fine spline. Only the 77 mag case version was coarse.