It is nice if I think I lathed the end straight, and also nice that I think I cut the shaft tube straight, but I decided driveshaft runout is probably the only thing that counts, so I decided to check it before I tacked it up, and I am glad I did. There was about.080 TIM. I looked online and it seems like people think somewhere from .005 to .020 is ok. People report stuff like .060 being good to 80 mph, sometimes. The transmission end of the shaft measured at .020 so I made that my target.
I marked what was high and low, pulled the shaft out and tried to beat the cap straighter. Put it back in, and checked it. After repeating this process 3 or 4 times I was below .020 so I tacked it:
It was easy enough to start and stop on the tacks so I didn't need to roll it. I dipped the tungsten 0 times which was nice. I could have slid along at like 85 amps and made this beautiful, but the bevel was pretty tight, so I had to really watch to make sure the puddle was wetting all the way to the bottom before jamming rod in. Consequently I had to bake this a little bit especially with the heavy casting on the other side. I went at like 110 amps and even that was probably a bit low as I was floored and waiting most of the time. But it looks pretty good I think:
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