I'm pretty sure this is a 3-speed but don't know which model. I currently have the stock 3-speed in my '53 3100 and didn't know if this would be a better transmission to use. Thanks for any help.

It has a 10 spline shaft and the numbers are in the photos.

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Allan
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1951 GMC 1/2-ton
Two 1953 Chevy 3100 5-window