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For reference:
The new Getrag's input shaft is 23 spine, but it's only 1-1/32" diameter.
That's actually a smaller diameter than the standard Ford 10-spline, which is 1-1/16 inch, but the finer splines leave more material for strength.
The T56 spline is bigger than both at 1-1/8" inch, 26 spline. It's virtually unbreakable. The Supra Turbo's input shaft is a 1-1/4 inch diameter 14 spline. Very strong too.
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