I watched the video. His explanation of gear weight may have some relevance but I doubt it.
It is RPM and clutch disc weight and the number of teeth on the syncro and gear that make them not shift at rpm. You can easily remedy this by slick shifting the sliders, gears and syncros. Then reassemble the box with all the parts.
It will shift smooth and clean at whatever RPM you have the balls for.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
