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A syncro will wear quicker when speed shifting. This is similar to hard braking wearing tires faster.
When there is enough wear the syncro has difficulty slowing down the gears to properly mesh, similar to a tire with little tread not grabbing well on a curve or hard braking at high g force.
When this starts to happen then the syncro grinds and makes its teeth as well as the teeth on the gear round off.
The answer to syncro long life is to shift normal including down shifting approaching a red light. One will find they will tire of the vehicle before the syncro will require replacement.
Shifting fast will cause quicker wear similar to hard driving wears tires.
I find premature syncro wear on vehicles that do not replace the lube with the factory required lube. OEM is best no matter what.
The syncros in modern transmissions are made of different materials and the lube is engineered to the specific application.
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NH
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