You will learn to take your time. You can't rush these transmissions. Smooth and steady will get it there. Timing is everything. I had a real time after putting the 237 in, as it does not rev as the old 673 did and I had to slow my shifting even more.
Someone posted my two hand shifting that I did a year or so later after the first video.
Yes, I have all the ATHS videos from back when. I also have the special all twin stick DVD that Lindsey put out about 15 yrs ago? Neat stuff. There is some of it on Youtube, but not all. I met Dr. Bill at the Syracuse ATHS nationals in '03. He invited everyone to climb in his W71 and play around.
I put air steering on mine about 5 yrs ago. I gathered up pieces from a fellow here on BMT. I got lucky, it was a system from a fire truck and very low use. Everything was in good shape, just needed a few things touched up. It has worked flawlessly. Yes, they do have their drawbacks and I suppose when they wear out they can be bad. Surely beats Armstrong steering after all these years of driving it. Air o Matic was bought out by a company in Cleveland, Ohio(local to me). They offered some parts, but I see their website does not list it anymore. Likely going to get real scarce.
Mine after cleaning it up, fixing the mounting bushing for the ram and installing a new boot(rancho shock boot)
Here is the new bearing installed. The original bearing was gone, I had to make a bushing for this bearing as it was an odd size. Working at a machine shop has its advantages.