I'm not sure I follow exactly what your question is, but if you're wondering about syncro transmissions in farm tractors, then that's been done quite extensively. Both with dry clutches and wet clutches. Ford has done it since 1981 with the 10 series and then updated with the 30 series to have a 100% syncronized 8x8 transmission. Works like a top when it doesn't blow a syncro.... The had a variety of others as well. Syncro's are pretty well a past thing with farm tractors today though. Most are power shift now. These are all direct drive with wet clutches, planetaries and computer modulated shifting. That seems to be about the only way they can keep clutches in them. For my own part I quite like having the older style constant mesh crash boxes (sliding collar tansmissions). Their biggest failing was a lack of reverse ratios, but they shift fairly easily and are nearly indestructable.
The link you provided appears to be a race transmission. That looks complicated, expensive to build and probably even more expensive to maintain, keys to why it's not used in anything other than on an oval.
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