[TR] why could my brother change gear in an old Triumph without using the clutch

[Sujit Roy]

We had a Triumph Toledo and the gearbox whined like no bodies business.
He had this skill, which I could do, to change gear either up or down
without using the clutch.

He mentioned that he needed to get the engine speed in sync with the
gearbox.
If the gearbox was new, could he still do this?

I'm assuming this is how people with dog gears do this without the gears
grinding.

Sujit
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