Yup! The syncros keep the gears from 'grinding'
What happens when you shift is the appropriate
'slider', the are two one for 1&2 gear and one for
3&4 gear, moves toward the gear you have selected.
The gears 1,2,3,4 are in conatant mesh with the
cluster gear gears (counter shaft). As the slider
moves toward the selected gear the syncro ring
engages the cone on the gear. The little teeth on
the inside of the syncro "brake' the gear so the
input and output shaft are rotating the same
speed. The slider gear can the move over the
little 'dog' teeth on the gear it attempting to
engage. When it slips over the dog teeth the gear
is engaged and off you go. The grinding noise you
hear when in the process of missing a shift is the
slider/syncro ring assy. banging against the dog
teeth on the gear you're trying to engage not the
actual gear teeth themselves. Reverse has an idler
gear that does engage gear teeth directly and will
shuck parts if aggravated. If you have a parts
blow up it will be easier to see what I'm
attempting to explain.
Hope this helps at least a little.
Bill
'70 6
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