Taper shaft 85 HP

All I can tell you is it's not Pipe thread, and it's not coarse thread. The threaded portion is not tapered and it is fine threads, I don't now the TPI, or diameter.
Bill B
 
I searched and was told it is 1 1/2" 18tpi. (18threads per inch). However I cannot verify this info.

Bill B
 
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