'51 3100 drive shaft removal

[TKG Midwest]

Help! Another problem from the new guy. Please give guidance on how to remove the drive shaft on my '51 3100 three speed..I've read the manual, looked at the pics in the assembly manual, and have gotten nowhere fast. I'll try and post a couple of pictures of what I'm dealing with. The reason I'm dropping the DS is to count the "Swirls"? Inside the tranny so I can get the right speedo cable adapter the previous owner as kind enough to lose or sell...