I ended up with a saginaw style flange for my hack n tap, since I wanted to do away with the slip yoke before my new driveshaft. Bought a 7/16 rapidcut bit from precision tool and it worked very well, cut like butter once I got through the 1/4" or so of hardening on the end of the output shaft.
Tapping the shaft was a different story. I knew my crappy harbor fright tap would most likely be obliterated in the process, so I purchased a craftsman set for the job.
The craftsman tap started the first few threads but was shortly destroyed, turn over the box and it says made in china. I understand it's tapping harded steel but i figured it would hold up much better than it did. I assumed most of thier stuff was made in the U.S. still? Especially when quality materials are a must i.e. in a tap set.
Luckily the HF taps finished the job and I returned the craftsman set the next day. The store clerk informed me that they are having a ton of problems, and a lot of returns since craftsman has started outsourcing some of their tools to china. Which was the first i have heard of it.