Back in the day before syncros, downshifting a manual tranny smoothly was an artform. One had to get everything spinning at close to the same speed before meshing the gears. This was done by engaging (or is it disengaging?) how bout pushing the clutch, dropping to neutral, releasing the clutch, blipping the throttle to get things in the tranny spinning faster, pushing the clutch in again and shifting to the next lower gear. Doing this now is unnecessary, but there is one case where I find that the syncros need a little help. After coasting down a long hill in neutral, everything in the tranny other than the output shaft is spinning pretty slow. Attempting to engage 5th gear at 70 mph after coasting is apparently a little too much to ask of my decade old, 94K mile syncros,so the tranny lets me know with a bit of gear gnashing. I now throttle the engine up to about 2500, depress the clutch and it slides right in smoov as butta.