Here's the spline dimensions from the 55.1 Vehicle Info kit.
10 splines - 1.11-1.121 inches OD
Attachments
Input shaft spline dimensions.jpg (11.21 KB, 114 downloads)

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.